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Mercedes-Benz Check Engine Light | Top 5 Causes for Each Model

TABLE OF CONTENTS

Diagnose and clear your check engine light!

If possible, try to scan your vehicle. You can read your check engine light with or without a scanner and get an exact diagnosis rather than rely only on your powers of deduction. 

But, if you are on the side of the road and in a rush, this list of common causes for each Hyundai model should help you narrow down the most likely cause of your issue.

Take a look through the tables below for the most common causes for your Hyundai models’ Check Engine Light. If none of the causes below match the symptoms you’re experiencing or if you want a more in depth explanation of the common causes, go ahead and check out “The 13 Most Common Causes For A Check Engine Light | How To Diagnose Them”.

Let’s dive in.

Mercedes-Benz C230 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

 

DTC Codes 

Most Common Causes 

Repair

Repair Cost

#1

P0171

Dirty mass airflow sensor

Clean mass airflow sensor

Clean mass airflow sensor: $20 – $100

Faulty mass airflow sensor

Replace mass airflow sensor

Replace mass airflow sensor: $230 – $330

Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket

Seal vacuum leak

Vacuum leak $100 – $200

#2

P0172

Dirty mass airflow sensor

Clean mass airflow sensor

Clean mass airflow sensor: $20 – $100

Faulty mass airflow sensor

Replace mass airflow sensor

Replace mass airflow sensor: $230 – $330

Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket

Seal vacuum leak

Vacuum leak: $100 – $200

Clogged fuel injectors

Clean fuel injectors

Clean fuel injectors: $50 – $80

#3

P0128

Faulty engine coolant thermostat

Replace engine coolant thermostat

Replace engine coolant thermostat: $40 – $190

#4

P0410

Blown air injector fuse

Replace air injector fuse

Fuse: $10

Faulty air pump

Replace air pump

Air Pump: $570-$710

Faulty air pump relay

Replace air pump relay

Air Pump Relay: $50-$75

#5

P0301

Spark plug #1 is worn or broken

Replace spark plug #1 

Spark plugs: $66-$250

Ignition coils are broken

Replace ignition coils

Ignition Coils: $230-$640 (some cars require Intake manifold removal)

Spark plug wires are worn

Replace spark plug wires

Spark plug wires: $180-$240

Fuel injectors are broken

Replace fuel injectors

Fuel injectors: $1500-$1900

Mercedes-Benz C240 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

 

DTC Codes 

Most Common Causes 

Repair

Repair Cost

#1

P0300

Spark plug is worn or broken

Replace spark plugs

Spark plugs: $66-$250

Ignition coils are broken

Replace ignition coils

Ignition Coils: $230-$640 (some cars require Intake manifold removal)

Spark plug wires are worn

Replace spark plug wires

Spark plug wires: $180-$240

Fuel injectors are broken

Replace fuel injectors

Fuel injectors: $1500-$1900

#2

P0171

Dirty mass airflow sensor

Clean mass airflow sensor

Clean mass airflow sensor: $20 – $100

Faulty mass airflow sensor

Replace mass airflow sensor

Replace mass airflow sensor: $230 – $330

Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket

Seal vacuum leak

Vacuum leak $100 – $200

#3

P0410

Blown air injector fuse

Replace air injector fuse

Fuse: $10

Faulty air pump

Replace air pump

Air Pump: $570-$710

Faulty air pump relay

Replace air pump relay

Air Pump Relay: $50-$75

#4

P0174

Dirty mass airflow sensor

Clean mass airflow sensor

Clean mass airflow sensor: $20 – $100

Faulty mass airflow sensor

Replace mass airflow sensor

Replace mass airflow sensor: $230 – $330

Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket

Seal vacuum leak

Vacuum leak: $100 – $200

Clogged fuel injectors

Clean fuel injectors

Clean fuel injectors: $50 – $80

Mercedes-Benz C250 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

 

DTC Codes 

Most Common Causes 

Repair

Repair Cost

#1

P0340

Faulty camshaft position sensor 

Replace camshaft position sensor 

Camshaft position sensor $120-$300 

Faulty crankshaft position sensor 

Replace crankshaft position sensor 

Crankshaft position sensor $190-$250 

Faulty ECM 

Replace ECM 

ECM $1000-$1200 

Faulty timing chain or belt replacement

Replace timing chain or belt replacement

Timing chain or belt replacement $200-$1000

#2

P0441

Damaged charcoal cannister

Replace charcoal cannister

Replace charcoal cannister: $753 – $1000

Loose or missing gas cap

Replace or tighten gas cap

Replace or tighten gas cap: $0 – $20

Faulty purge valve

Replace purge valve

Replace purge valve: $109 – $172

#3

P0304

Spark plug #4 is worn or broken

Replace spark plug #4 

Spark plugs: $66-$250

Ignition coils are broken

Replace ignition coils

Ignition Coils: $230-$640 (some cars require Intake manifold removal)

Spark plug wires are worn

Replace spark plug wires

Spark plug wires: $180-$240 

Fuel injectors are broken

Replace fuel injectors

Fuel injectors: $1500-$1900

#4

P0303

Spark plug #3 is worn or broken

Replace spark plug #3

Spark plugs: $66-$250

Ignition coils are broken

Replace ignition coils

Ignition Coils: $230-$640 (some cars require Intake manifold removal)

Spark plug wires are worn

Replace spark plug wires

Spark plug wires: $180-$240

Fuel injectors are broken

Replace fuel injectors

Fuel injectors: $1500-$1900

Mercedes-Benz C280 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

 

DTC Codes 

Most Common Causes 

Repair

Repair Cost

#1

P0300

Spark plug is worn or broken

Replace spark plugs

Spark plugs: $66-$250

Ignition coils are broken

Replace ignition coils

Ignition Coils: $230-$640 (some cars require Intake manifold removal)

Spark plug wires are worn

Replace spark plug wires

Spark plug wires: $180-$240

Fuel injectors are broken

Replace fuel injectors

Fuel injectors: $1500-$1900

#2

P2006

Faulty manifold absolute pressure sensor

Replace manifold absolute pressure sensor

Manifold absolute pressure sensor: $140 – $170

Carbon buildup on intake manifold runner control system

Replace intake manifold runner control system

Intake manifold runner control system: $350 – $600

#3

P0410

Blown air injector fuse

Replace air injector fuse

Fuse: $10

Faulty air pump

Replace air pump

Air Pump: $570-$710

Faulty air pump relay

Replace air pump relay

Air Pump Relay: $50-$75

Mercedes-Benz C300 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

 

DTC Codes 

Most Common Causes 

Repair

Repair Cost

#1

P0128

Faulty engine coolant thermostat

Replace engine coolant thermostat

Replace engine coolant thermostat: $40 – $190

#2

P0410

Blown air injector fuse

Replace air injector fuse

Fuse: $10

Faulty air pump

Replace air pump

Air Pump: $570-$710

Faulty air pump relay

Replace air pump relay

Air Pump Relay: $50-$75

#3

P0300

Spark plug is worn or broken

Replace spark plugs

Spark plugs: $66-$250

Ignition coils are broken

Replace ignition coils

Ignition Coils: $230-$640 (some cars require Intake manifold removal)

Spark plug wires are worn

Replace spark plug wires

Spark plug wires: $180-$240

Fuel injectors are broken

Replace fuel injectors

Fuel injectors: $1500-$1900

#4

P0301

Spark plug #1 is worn or broken

Replace spark plug #1 

Spark plugs: $66-$250

Ignition coils are broken

Replace ignition coils

Ignition Coils: $230-$640 (some cars require Intake manifold removal)

Spark plug wires are worn

Replace spark plug wires

Spark plug wires: $180-$240

Fuel injectors are broken

Replace fuel injectors

Fuel injectors: $1500-$1900

Mercedes-Benz C320 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

 

DTC Codes 

Most Common Causes 

Repair

Repair Cost

#1

P0400

Stuck EGR valve

Replace the EGR valve

EGR valve: $250 – $350

Faulty EGR temperature sensor

Replace the EGR temperature sensor

EGR temperature sensor: $220 – $230

#2

P0410

Blown air injector fuse

Replace air injector fuse

Fuse: $10

Faulty air pump

Replace air pump

Air Pump: $570-$710

Faulty air pump relay

Replace air pump relay

Air Pump Relay: $50-$75

#3

P0300

Spark plug is worn or broken

Replace spark plugs

Spark plugs: $66-$250

Ignition coils are broken

Replace ignition coils

Ignition Coils: $230-$640 (some cars require Intake manifold removal)

Spark plug wires are worn

Replace spark plug wires

Spark plug wires: $180-$240

Fuel injectors are broken

Replace fuel injectors

Fuel injectors: $1500-$1900

#4

P0301

Spark plug #1 is worn or broken

Replace spark plug #1 

Spark plugs: $66-$250

Ignition coils are broken

Replace ignition coils

Ignition Coils: $230-$640 (some cars require Intake manifold removal)

Spark plug wires are worn

Replace spark plug wires

Spark plug wires: $180-$240

Fuel injectors are broken

Replace fuel injectors

Fuel injectors: $1500-$1900

Mercedes-Benz C350 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

 

DTC Codes 

Most Common Causes 

Repair

Repair Cost

#1

P0016

Low oil/dirty oil

Get an oil change or add oil

Engine oil and filter change $20-$60

Timing chain is stretched

Replace timing chain

Timing chain: $1,624 to $1,879

Slipped reluctor ring on the crankshaft

Replace reluctor ring

Reluctor ring $200-$600

#2

P0128

Faulty engine coolant thermostat

Replace engine coolant thermostat

Replace engine coolant thermostat: $40 – $190

#3

P2006

Faulty manifold absolute pressure sensor

Replace manifold absolute pressure sensor

Manifold absolute pressure sensor: $140 – $170

Carbon buildup on intake manifold runner control system

Replace intake manifold runner control system

Intake manifold runner control system: $350 – $600

#4

P0300

Spark plug is worn or broken

Replace spark plugs

Spark plugs: $66-$250

Ignition coils are broken

Replace ignition coils

Ignition Coils: $230-$640 (some cars require Intake manifold removal)

Spark plug wires are worn

Replace spark plug wires

Spark plug wires: $180-$240

Fuel injectors are broken

Replace fuel injectors

Fuel injectors: $1500-$1900

Mercedes-Benz C63 AMG CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

 

DTC Codes 

Most Common Causes 

Repair

Repair Cost

#1

P0171

Dirty mass airflow sensor

Clean mass airflow sensor

Clean mass airflow sensor: $20 – $100

Faulty mass airflow sensor

Replace mass airflow sensor

Replace mass airflow sensor: $230 – $330

Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket

Seal vacuum leak

Vacuum leak $100 – $200

#2

P0174

Dirty mass airflow sensor

Clean mass airflow sensor

Clean mass airflow sensor: $20 – $100

Faulty mass airflow sensor

Replace mass airflow sensor

Replace mass airflow sensor: $230 – $330

Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket

Seal vacuum leak

Vacuum leak: $100 – $200

Clogged fuel injectors

Clean fuel injectors

Clean fuel injectors: $50 – $80

#3

P0303

Spark plug #3 is worn or broken

Replace spark plug #3

Spark plugs: $66-$250

Ignition coils are broken

Replace ignition coils

Ignition Coils: $230-$640 (some cars require Intake manifold removal)

Spark plug wires are worn

Replace spark plug wires

Spark plug wires: $180-$240

Fuel injectors are broken

Replace fuel injectors

Fuel injectors: $1500-$1900

#4

P0420

Damaged or worn-out catalytic converter

Replace catalytic converter

Replace catalytic converter: $400-$2400

Broken O2 sensor

Replace downstream O2 sensor

Oxygen sensor replacement: $275-$500

Exhaust leak

Seal exhaust leak

Exhaust leak: $100-$200 (if welded to repair)

Mercedes-Benz CL500 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

 

DTC Codes 

Most Common Causes 

Repair

Repair Cost

#1

P0300

Spark plug is worn or broken

Replace spark plugs

Spark plugs: $66-$250

Ignition coils are broken

Replace ignition coils

Ignition Coils: $230-$640 (some cars require Intake manifold removal)

Spark plug wires are worn

Replace spark plug wires

Spark plug wires: $180-$240

Fuel injectors are broken

Replace fuel injectors

Fuel injectors: $1500-$1900

#2

P0302

Spark plug #2 is worn or broken

Replace spark plug #2 

Spark plugs: $66-$250

Ignition coils are broken

Replace ignition coils

Ignition Coils: $230-$640 (some cars require Intake manifold removal)

Spark plug wires are worn

Replace spark plug wires

Spark plug wires: $180-$240

Fuel injectors are broken

Replace fuel injectors

Fuel injectors: $1500-$1900

#3

P0303

Spark plug #3 is worn or broken

Replace spark plug #3

Spark plugs: $66-$250

Ignition coils are broken

Replace ignition coils

Ignition Coils: $230-$640 (some cars require Intake manifold removal)

Spark plug wires are worn

Replace spark plug wires

Spark plug wires: $180-$240

Fuel injectors are broken

Replace fuel injectors

Fuel injectors: $1500-$1900

#4

P0305

Spark plug #5 is worn or broken

Replace spark plug #5 

Spark plugs: $66-$250

Ignition coils are broken

Replace ignition coils

Ignition Coils: $230-$640 (some cars require Intake manifold removal)

Spark plug wires are worn

Replace spark plug wires

Spark plug wires: $180-$240

Fuel injectors are broken

Replace fuel injectors

Fuel injectors: $1500-$1900

#5

P0301

Spark plug #1 is worn or broken

Replace spark plug #1 

Spark plugs: $66-$250

Ignition coils are broken

Replace ignition coils

Ignition Coils: $230-$640 (some cars require Intake manifold removal)

Spark plug wires are worn

Replace spark plug wires

Spark plug wires: $180-$240

Fuel injectors are broken

Replace fuel injectors

Fuel injectors: $1500-$1900

Mercedes-Benz CLK320 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

 

DTC Codes 

Most Common Causes 

Repair

Repair Cost

#1

P0400

Stuck EGR valve

Replace the EGR valve

EGR valve: $250 – $350

Faulty EGR temperature sensor

Replace the EGR temperature sensor

EGR temperature sensor: $220 – $230

#2

P0300

Spark plug is worn or broken

Replace spark plugs

Spark plugs: $66-$250

Ignition coils are broken

Replace ignition coils

Ignition Coils: $230-$640 (some cars require Intake manifold removal)

Spark plug wires are worn

Replace spark plug wires

Spark plug wires: $180-$240

Fuel injectors are broken

Replace fuel injectors

Fuel injectors: $1500-$1900

#3

  

    P0410

Blown air injector fuse

Replace air injector fuse

Fuse: $10

Faulty air pump

Replace air pump

Air Pump: $570-$710

Faulty air pump relay

Replace air pump relay

Air Pump Relay: $50-$75

#4

P0455

Missing, loose, or damaged gas cap

TIghten or replace gas cap

Missing or damaged gas cap: $0-$20

Leak in EVAP line

Fix leap in EVAP line

EVAP line: $20-$100

EVAP vent control valve is damaged or stuck

Replace EVAP vent control valve

EVAP vent control valve: $150-$200

EVAP purge volume control valve is damaged or stuck

Replace EVAP purge volume control valve

Purge volume control valve: $150-$200

Mercedes-Benz CLK350 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

 

DTC Codes 

Most Common Causes 

Repair

Repair Cost

#1

P0016

Low oil/dirty oil

Get an oil change or add oil

Engine oil and filter change $20-$60

Timing chain is stretched

Replace timing chain

Timing chain: $1,624 to $1,879

Slipped reluctor ring on the crankshaft

Replace reluctor ring

Reluctor ring $200-$600

#2

P2006

Faulty manifold absolute pressure sensor

Replace manifold absolute pressure sensor

Manifold absolute pressure sensor: $140 – $170

Carbon buildup on intake manifold runner control system

Replace intake manifold runner control system

Intake manifold runner control system: $350 – $600

#3

P0303

Spark plug #3 is worn or broken

Replace spark plug #3

Spark plugs: $66-$250

Ignition coils are broken

Replace ignition coils

Ignition Coils: $230-$640 (some cars require Intake manifold removal)

Spark plug wires are worn

Replace spark plug wires

Spark plug wires: $180-$240

Fuel injectors are broken

Replace fuel injectors

Fuel injectors: $1500-$1900

#4

P0017

Low oil/dirty oil

Get an oil change or add oil

Engine oil and filter change $20-$60

Timing chain is stretched

Replace timing chain

Timing chain: $1,624 to $1,879

Slipped reluctor ring on the crankshaft

Replace reluctor ring

Reluctor ring $200-$600

#5

P0128

Faulty engine coolant thermostat

Replace engine coolant thermostat

Replace engine coolant thermostat: $40 – $190

Mercedes-Benz E320 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

 

DTC Codes 

Most Common Causes 

Repair

Repair Cost

#1

P0400

Stuck EGR valve

Replace the EGR valve

EGR valve: $250 – $350

Faulty EGR temperature sensor

Replace the EGR temperature sensor

EGR temperature sensor: $220 – $230

#2

P0410

Blown air injector fuse

Replace air injector fuse

Fuse: $10

Faulty air pump

Replace air pump

Air Pump: $570-$710

Faulty air pump relay

Replace air pump relay

Air Pump Relay: $50-$75

#3

P0455

Missing, loose, or damaged gas cap

TIghten or replace gas cap

Missing or damaged gas cap: $0-$20

Leak in EVAP line

Fix leap in EVAP line

EVAP line: $20-$100

EVAP vent control valve is damaged or stuck

Replace EVAP vent control valve

EVAP vent control valve: $150-$200

EVAP purge volume control valve is damaged or stuck

Replace EVAP purge volume control valve

Purge volume control valve: $150-$200

#4

P0300

Spark plug is worn or broken

Replace spark plugs

Spark plugs: $66-$250

Ignition coils are broken

Replace ignition coils

Ignition Coils: $230-$640 (some cars require Intake manifold removal)

Spark plug wires are worn

Replace spark plug wires

Spark plug wires: $180-$240

Fuel injectors are broken

Replace fuel injectors

Fuel injectors: $1500-$1900

#5

P0304

Spark plug #4 is worn or broken

Replace spark plug #4 

Spark plugs: $66-$250

Ignition coils are broken

Replace ignition coils

Ignition Coils: $230-$640 (some cars require Intake manifold removal)

Spark plug wires are worn

Replace spark plug wires

Spark plug wires: $180-$240 

Fuel injectors are broken

Replace fuel injectors

Fuel injectors: $1500-$1900

Mercedes-Benz E350 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

 

DTC Codes 

Most Common Causes 

Repair

Repair Cost

#1

P0016

Low oil/dirty oil

Get an oil change or add oil

Engine oil and filter change $20-$60

Timing chain is stretched

Replace timing chain

Timing chain: $1,624 to $1,879

Slipped reluctor ring on the crankshaft

Replace reluctor ring

Reluctor ring $200-$600

#2

P0017

Low oil/dirty oil

Get an oil change or add oil

Engine oil and filter change $20-$60

Timing chain is stretched

Replace timing chain

Timing chain: $1,624 to $1,879

Slipped reluctor ring on the crankshaft

Replace reluctor ring

Reluctor ring $200-$600

#3

P2006

Faulty manifold absolute pressure sensor

Replace manifold absolute pressure sensor

Manifold absolute pressure sensor: $140 – $170

Carbon buildup on intake manifold runner control system

Replace intake manifold runner control system

Intake manifold runner control system: $350 – $600

#4

P0300

Spark plug is worn or broken

Replace spark plugs

Spark plugs: $66-$250

Ignition coils are broken

Replace ignition coils

Ignition Coils: $230-$640 (some cars require Intake manifold removal)

Spark plug wires are worn

Replace spark plug wires

Spark plug wires: $180-$240

Fuel injectors are broken

Replace fuel injectors

Fuel injectors: $1500-$1900

#5

P0128

Faulty engine coolant thermostat

Replace engine coolant thermostat

Replace engine coolant thermostat: $40 – $190

Mercedes-Benz E420 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

 

DTC Codes 

Most Common Causes 

Repair

Repair Cost

#1

P0455

Missing, loose, or damaged gas cap

TIghten or replace gas cap

Missing or damaged gas cap: $0-$20

Leak in EVAP line

Fix leap in EVAP line

EVAP line: $20-$100

EVAP vent control valve is damaged or stuck

Replace EVAP vent control valve

EVAP vent control valve: $150-$200

EVAP purge volume control valve is damaged or stuck

Replace EVAP purge volume control valve

Purge volume control valve: $150-$200

#2

P0140

Faulty oxygen sensor

Replace oxygen sensor

Oxygen sensor: $200 – $300

Faulty mass airflow sensor

Replace mass airflow sensor

Mass airflow sensor: $230 – $330

Mercedes-Benz E500 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

 

DTC Codes 

Most Common Causes 

Repair

Repair Cost

#1

P0410

Blown air injector fuse

Replace air injector fuse

Fuse: $10

Faulty air pump

Replace air pump

Air Pump: $570-$710

Faulty air pump relay

Replace air pump relay

Air Pump Relay: $50-$75

#2

P0456

Missing, loose, or damaged gas cap

TIghten or replace gas cap

Missing or damaged gas cap: $0-$20

Leak in EVAP line

Fix leap in EVAP line

EVAP line: $20-$100

EVAP vent control valve is damaged or stuck

Replace EVAP vent control valve

EVAP vent control valve: $150-$200

EVAP purge volume control valve is damaged or stuck

Replace EVAP purge volume control valve

Purge volume control valve: $150-$200

#3

P0300

Spark plug is worn or broken

Replace spark plugs

Spark plugs: $66-$250

Ignition coils are broken

Replace ignition coils

Ignition Coils: $230-$640 (some cars require Intake manifold removal)

Spark plug wires are worn

Replace spark plug wires

Spark plug wires: $180-$240

Fuel injectors are broken

Replace fuel injectors

Fuel injectors: $1500-$1900

#4

P0171

Dirty mass airflow sensor

Clean mass airflow sensor

Clean mass airflow sensor: $20 – $100

Faulty mass airflow sensor

Replace mass airflow sensor

Replace mass airflow sensor: $230 – $330

Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket

Seal vacuum leak

Vacuum leak $100 – $200

#5

P0400

Stuck EGR valve

Replace the EGR valve

EGR valve: $250 – $350

Faulty EGR temperature sensor

Replace the EGR temperature sensor

EGR temperature sensor: $220 – $230

Mercedes-Benz GL450 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

 

DTC Codes 

Most Common Causes 

Repair

Repair Cost

#1

P0420

Damaged or worn-out catalytic converter

Replace catalytic converter

Replace catalytic converter: $400-$2400

Broken O2 sensor

Replace downstream O2 sensor

Oxygen sensor replacement: $275-$500

Exhaust leak

Seal exhaust leak

Exhaust leak: $100-$200 (if welded to repair)

#2

P0128

Faulty engine coolant thermostat

Replace engine coolant thermostat

Replace engine coolant thermostat: $40 – $190

#3

P2006

Faulty manifold absolute pressure sensor

Replace manifold absolute pressure sensor

Manifold absolute pressure sensor: $140 – $170

Carbon buildup on intake manifold runner control system

Replace intake manifold runner control system

Intake manifold runner control system: $350 – $600

#4

P0430

Damaged or worn out catalytic converter

Replace catalytic converter

Replace catalytic converter: $400-$2400

Broken O2 sensor

Replace downstream O2 sensor

Replace catalytic converter: $400-$2400

Exhaust leak

Seal exhaust leak

Exhaust leak: $100-$200 (if welded to repair)

#5

P0455

Missing, loose, or damaged gas cap

TIghten or replace gas cap

Missing or damaged gas cap: $0-$20

Leak in EVAP line

Fix leap in EVAP line

EVAP line: $20-$100

EVAP vent control valve is damaged or stuck

Replace EVAP vent control valve

EVAP vent control valve: $150-$200

EVAP purge volume control valve is damaged or stuck

Replace EVAP purge volume control valve

Purge volume control valve: $150-$200

Mercedes-Benz ML320 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

 

DTC Codes 

Most Common Causes 

Repair

Repair Cost

#1

P0400

Stuck EGR valve

Replace the EGR valve

EGR valve: $250 – $350

Faulty EGR temperature sensor

Replace the EGR temperature sensor

EGR temperature sensor: $220 – $230

#2

P0300

Spark plug is worn or broken

Replace spark plugs

Spark plugs: $66-$250

Ignition coils are broken

Replace ignition coils

Ignition Coils: $230-$640 (some cars require Intake manifold removal)

Spark plug wires are worn

Replace spark plug wires

Spark plug wires: $180-$240

Fuel injectors are broken

Replace fuel injectors

Fuel injectors: $1500-$1900

#3

P0410

Blown air injector fuse

Replace air injector fuse

Fuse: $10

Faulty air pump

Replace air pump

Air Pump: $570-$710

Faulty air pump relay

Replace air pump relay

Air Pump Relay: $50-$75

#4

P0304

Spark plug #4 is worn or broken

Replace spark plug #4 

Spark plugs: $66-$250

Ignition coils are broken

Replace ignition coils

Ignition Coils: $230-$640 (some cars require Intake manifold removal)

Spark plug wires are worn

Replace spark plug wires

Spark plug wires: $180-$240 

Fuel injectors are broken

Replace fuel injectors

Fuel injectors: $1500-$1900

#5

P0455

Missing, loose, or damaged gas cap

TIghten or replace gas cap

Missing or damaged gas cap: $0-$20

Leak in EVAP line

Fix leap in EVAP line

EVAP line: $20-$100

EVAP vent control valve is damaged or stuck

Replace EVAP vent control valve

EVAP vent control valve: $150-$200

EVAP purge volume control valve is damaged or stuck

Replace EVAP purge volume control valve

Purge volume control valve: $150-$200

Mercedes-Benz ML350 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

 

DTC Codes 

Most Common Causes 

Repair

Repair Cost

#1

P0410

Blown air injector fuse

Replace air injector fuse

Fuse: $10

Faulty air pump

Replace air pump

Air Pump: $570-$710

Faulty air pump relay

Replace air pump relay

Air Pump Relay: $50-$75

#2

P0016

Low oil/dirty oil

Get an oil change or add oil

Engine oil and filter change $20-$60

Timing chain is stretched

Replace timing chain

Timing chain: $1,624 to $1,879

Slipped reluctor ring on the crankshaft

Replace reluctor ring

Reluctor ring $200-$600

#3

P0128

Faulty engine coolant thermostat

Replace engine coolant thermostat

Replace engine coolant thermostat: $40 – $190

#4

P0017

Low oil/dirty oil

Get an oil change or add oil

Engine oil and filter change $20-$60

Timing chain is stretched

Replace timing chain

Timing chain: $1,624 to $1,879

Slipped reluctor ring on the crankshaft

Replace reluctor ring

Reluctor ring $200-$600

#5

P0455

Missing, loose, or damaged gas cap

TIghten or replace gas cap

Missing or damaged gas cap: $0-$20

Leak in EVAP line

Fix leap in EVAP line

EVAP line: $20-$100

EVAP vent control valve is damaged or stuck

Replace EVAP vent control valve

EVAP vent control valve: $150-$200

EVAP purge volume control valve is damaged or stuck

Replace EVAP purge volume control valve

Purge volume control valve: $150-$200

Mercedes-Benz ML500 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

 

DTC Codes 

Most Common Causes 

Repair

Repair Cost

#1

P0410

Blown air injector fuse

Replace air injector fuse

Fuse: $10

Faulty air pump

Replace air pump

Air Pump: $570-$710

Faulty air pump relay

Replace air pump relay

Air Pump Relay: $50-$75

#2

P0400

Stuck EGR valve

Replace the EGR valve

EGR valve: $250 – $350

Faulty EGR temperature sensor

Replace the EGR temperature sensor

EGR temperature sensor: $220 – $230

#3

P0455

Missing, loose, or damaged gas cap

TIghten or replace gas cap

Missing or damaged gas cap: $0-$20

Leak in EVAP line

Fix leap in EVAP line

EVAP line: $20-$100

EVAP vent control valve is damaged or stuck

Replace EVAP vent control valve

EVAP vent control valve: $150-$200

EVAP purge volume control valve is damaged or stuck

Replace EVAP purge volume control valve

Purge volume control valve: $150-$200

#4

P0171

Dirty mass airflow sensor

Clean mass airflow sensor

Clean mass airflow sensor: $20 – $100

Faulty mass airflow sensor

Replace mass airflow sensor

Replace mass airflow sensor: $230 – $330

Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket

Seal vacuum leak

Vacuum leak $100 – $200

Mercedes-Benz R350 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

 

DTC Codes 

Most Common Causes 

Repair

Repair Cost

#1

P2006

Faulty manifold absolute pressure sensor

Replace manifold absolute pressure sensor

Manifold absolute pressure sensor: $140 – $170

Carbon buildup on intake manifold runner control system

Replace intake manifold runner control system

Intake manifold runner control system: $350 – $600

#2

P0016

Low oil/dirty oil

Get an oil change or add oil

Engine oil and filter change $20-$60

Timing chain is stretched

Replace timing chain

Timing chain: $1,624 to $1,879

Slipped reluctor ring on the crankshaft

Replace reluctor ring

Reluctor ring $200-$600

#3

P0300

Spark plug is worn or broken

Replace spark plugs

Spark plugs: $66-$250

Ignition coils are broken

Replace ignition coils

Ignition Coils: $230-$640 (some cars require Intake manifold removal)

Spark plug wires are worn

Replace spark plug wires

Spark plug wires: $180-$240

Fuel injectors are broken

Replace fuel injectors

Fuel injectors: $1500-$1900

#4

P0017

Low oil/dirty oil

Get an oil change or add oil

Engine oil and filter change $20-$60

Timing chain is stretched

Replace timing chain

Timing chain: $1,624 to $1,879

Slipped reluctor ring on the crankshaft

Replace reluctor ring

Reluctor ring $200-$600

#5

P0128

Faulty engine coolant thermostat

Replace engine coolant thermostat

Replace engine coolant thermostat: $40 – $190

Mercedes-Benz S430 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

 

DTC Codes 

Most Common Causes 

Repair

Repair Cost

#1

P0400

Stuck EGR valve

Replace the EGR valve

EGR valve: $250 – $350

Faulty EGR temperature sensor

Replace the EGR temperature sensor

EGR temperature sensor: $220 – $230

#2

P0410

Blown air injector fuse

Replace air injector fuse

Fuse: $10

Faulty air pump

Replace air pump

Air Pump: $570-$710

Faulty air pump relay

Replace air pump relay

Air Pump Relay: $50-$75

#3

P0300

Spark plug is worn or broken

Replace spark plugs

Spark plugs: $66-$250

Ignition coils are broken

Replace ignition coils

Ignition Coils: $230-$640 (some cars require Intake manifold removal)

Spark plug wires are worn

Replace spark plug wires

Spark plug wires: $180-$240

Fuel injectors are broken

Replace fuel injectors

Fuel injectors: $1500-$1900

Mercedes-Benz S500 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

 

DTC Codes 

Most Common Causes 

Repair

Repair Cost

#1

P0410

Blown air injector fuse

Replace air injector fuse

Fuse: $10

Faulty air pump

Replace air pump

Air Pump: $570-$710

Faulty air pump relay

Replace air pump relay

Air Pump Relay: $50-$75

#2

P0300

Spark plug is worn or broken

Replace spark plugs

Spark plugs: $66-$250

Ignition coils are broken

Replace ignition coils

Ignition Coils: $230-$640 (some cars require Intake manifold removal)

Spark plug wires are worn

Replace spark plug wires

Spark plug wires: $180-$240

Fuel injectors are broken

Replace fuel injectors

Fuel injectors: $1500-$1900

#3

P0400

Stuck EGR valve

Replace the EGR valve

EGR valve: $250 – $350

Faulty EGR temperature sensor

Replace the EGR temperature sensor

EGR temperature sensor: $220 – $230

#4

P0455

Missing, loose, or damaged gas cap

TIghten or replace gas cap

Missing or damaged gas cap: $0-$20

Leak in EVAP line

Fix leap in EVAP line

EVAP line: $20-$100

EVAP vent control valve is damaged or stuck

Replace EVAP vent control valve

EVAP vent control valve: $150-$200

EVAP purge volume control valve is damaged or stuck

Replace EVAP purge volume control valve

Purge volume control valve: $150-$200

#5

P0301

Spark plug #1 is worn or broken

Replace spark plug #1 

Spark plugs: $66-$250

Ignition coils are broken

Replace ignition coils

Ignition Coils: $230-$640 (some cars require Intake manifold removal)

Spark plug wires are worn

Replace spark plug wires

Spark plug wires: $180-$240

Fuel injectors are broken

Replace fuel injectors

Fuel injectors: $1500-$1900

Mercedes-Benz S550 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

 

DTC Codes 

Most Common Causes 

Repair

Repair Cost

#1

P0300

Spark plug is worn or broken

Replace spark plugs

Spark plugs: $66-$250

Ignition coils are broken

Replace ignition coils

Ignition Coils: $230-$640 (some cars require Intake manifold removal)

Spark plug wires are worn

Replace spark plug wires

Spark plug wires: $180-$240

Fuel injectors are broken

Replace fuel injectors

Fuel injectors: $1500-$1900

#2

P0455

Missing, loose, or damaged gas cap

TIghten or replace gas cap

Missing or damaged gas cap: $0-$20

Leak in EVAP line

Fix leap in EVAP line

EVAP line: $20-$100

EVAP vent control valve is damaged or stuck

Replace EVAP vent control valve

EVAP vent control valve: $150-$200

EVAP purge volume control valve is damaged or stuck

Replace EVAP purge volume control valve

Purge volume control valve: $150-$200

Mercedes-Benz S600 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

 

DTC Codes 

Most Common Causes 

Repair

Repair Cost

#1

P0300

Spark plug is worn or broken

Replace spark plugs

Spark plugs: $66-$250

Ignition coils are broken

Replace ignition coils

Ignition Coils: $230-$640 (some cars require Intake manifold removal)

Spark plug wires are worn

Replace spark plug wires

Spark plug wires: $180-$240

Fuel injectors are broken

Replace fuel injectors

Fuel injectors: $1500-$1900

#2

P0410

Blown air injector fuse

Replace air injector fuse

Fuse: $10

Faulty air pump

Replace air pump

Air Pump: $570-$710

Faulty air pump relay

Replace air pump relay

Air Pump Relay: $50-$75

#3

P0303

Spark plug #3 is worn or broken

Replace spark plug #3

Spark plugs: $66-$250

Ignition coils are broken

Replace ignition coils

Ignition Coils: $230-$640 (some cars require Intake manifold removal)

Spark plug wires are worn

Replace spark plug wires

Spark plug wires: $180-$240

Fuel injectors are broken

Replace fuel injectors

Fuel injectors: $1500-$1900

#4

P0302

Spark plug #2 is worn or broken

Replace spark plug #2 

Spark plugs: $66-$250

Ignition coils are broken

Replace ignition coils

Ignition Coils: $230-$640 (some cars require Intake manifold removal)

Spark plug wires are worn

Replace spark plug wires

Spark plug wires: $180-$240

Fuel injectors are broken

Replace fuel injectors

Fuel injectors: $1500-$1900

#5

P0301

Spark plug #1 is worn or broken

Replace spark plug #1 

Spark plugs: $66-$250

Ignition coils are broken

Replace ignition coils

Ignition Coils: $230-$640 (some cars require Intake manifold removal)

Spark plug wires are worn

Replace spark plug wires

Spark plug wires: $180-$240

Fuel injectors are broken

Replace fuel injectors

Fuel injectors: $1500-$1900

Mercedes-Benz SL500 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

 

DTC Codes 

Most Common Causes 

Repair

Repair Cost

#1

P0410

Blown air injector fuse

Replace air injector fuse

Fuse: $10

Faulty air pump

Replace air pump

Air Pump: $570-$710

Faulty air pump relay

Replace air pump relay

Air Pump Relay: $50-$75

#2

P0455

Missing, loose, or damaged gas cap

TIghten or replace gas cap

Missing or damaged gas cap: $0-$20

Leak in EVAP line

Fix leap in EVAP line

EVAP line: $20-$100

EVAP vent control valve is damaged or stuck

Replace EVAP vent control valve

EVAP vent control valve: $150-$200

EVAP purge volume control valve is damaged or stuck

Replace EVAP purge volume control valve

Purge volume control valve: $150-$200

Mercedes-Benz SLK230 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

 

DTC Codes 

Most Common Causes 

Repair

Repair Cost

#1

P0410

Blown air injector fuse

Replace air injector fuse

Fuse: $10

Faulty air pump

Replace air pump

Air Pump: $570-$710

Faulty air pump relay

Replace air pump relay

Air Pump Relay: $50-$75

#2

P0101

Engine air filter is very dirty

Replace the engine air filter

Air filter $50-70

Mass airflow sensor is dirty or broken

Replace the mass airflow sensor

Mass air flow sensor $220-320

Catalytic converter is damaged or worn

Replace the catalytic converter

Catalytic converter $1720-1780

#3

P0128

Faulty engine coolant thermostat

Replace engine coolant thermostat

Replace engine coolant thermostat: $40 – $190

#4

P0455

Missing, loose, or damaged gas cap

TIghten or replace gas cap

Missing or damaged gas cap: $0-$20

Leak in EVAP line

Fix leap in EVAP line

EVAP line: $20-$100

EVAP vent control valve is damaged or stuck

Replace EVAP vent control valve

EVAP vent control valve: $150-$200

EVAP purge volume control valve is damaged or stuck

Replace EVAP purge volume control valve

Purge volume control valve: $150-$200

Mercedes-Benz Sprinter 2500 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

 

DTC Codes 

Most Common Causes 

Repair

Repair Cost

#1

P0299

Faulty turbo or supercharger

Replace turbo or supercharger

Turbo or supercharger: $300 – $3400

Faulty boost pressure sensor

Replace boost pressure sensor

Boost pressure sensor: $200 – $220

#2

P2463

Faulty Diesel Particulate Filter

Replace Diesel Particulate Filter

Diesel Particulate Filter Replacement: $2500 – $8000

 

Clean Diesel Particulate Filter

Cleaning Diesel Particulate Filter: $150 – $200

FAQs – Mercedes-Benz Check Engine Light

How long can you drive with the check engine light?

Depending on how serious your Check Engine Light is, you may not want to drive. According to FIXD’s data on Check Engine Light causes, 40% of all Check Engine Lights are serious. Before you continue driving, pull over and figure out why it’s on.

If you have a Flashing Check Engine Light, the issue is likely serious. Misfires, a common cause of a flashing light, can cause severe and expensive engine damage. Unburnt fuel can make it into your exhaust and destroy your catalytic converter, which can cost over $1000 to replace. If your light is flashing, you probably want to get a tow, it will be cheaper in the long run.

If you have a Solid Check Engine Light or one that goes on and off seemingly at random or only under certain conditions (like hard acceleration), you may not need to get a tow and can probably drive a few days without a problem. But, you should pull over to check for common problems just to make sure the light is not an early warning sign of a larger issue like your car overheating, leaking fluids, or not pumping coolant or oil. Just get to a safe spot and check for the most common cause first: A loose gas cap. If that’s all it is, tighten it up and be on your way, the light should reset itself. If not, check out: What to Do When Your Check Engine Light Comes on. Checking for symptoms like rough idling, loud exhaust, or other warning lights will help you rule out a more serious problem. 

Is it safe to drive your Mercedes-Benz with the check engine light on?

It’s usually safe to drive your car for a few days with your Check Engine Light on as long as it’s not flashing. Some problems like engine misfires, which generally cause your Check Engine Light to flash, can make your car harder to control and can even start a fire in your car if left untreated for long enough. 

Although most times it’s safe to drive with your Check Engine Light on, you should always find out why it’s on ASAP. If something is seriously wrong with your car, the longer you drive, the higher the risk of costly repairs. According to FIXD’s data on Check Engine Light causes, 40% of all Check Engine Lights are serious.

What Does the Check Engine Light Mean?

When your Check Engine Light is on it means your car has identified a problem with the engine or transmission. There are over 1000 problems that can trigger a check engine light. Some are minor like a loose gas cap. Some, like an engine misfire, are more serious and can cause engine failure and/or damage.

The only way to know for sure what’s causing the check engine light is to diagnose it yourself or have a mechanic diagnose it. If you’d like to save some money; learning how to scan your car’s computer with a code reader isn’t hard and doing so will show you what system in your car is broken and you can narrow it down to likely repairs from there. This can help you decide if you can fix it or at the very least keep you from being overcharged at the mechanic. You can buy a small scanner like FIXD that fits in a glovebox, pocket, or purse if you want a clear answer on the severity of your light before you start driving again. Or check out: Where To Get Your CEL Checked if you need to find somewhere to get it checked fast.

What Does the Check Engine Light Look Like?

The check engine light is typically a yellow, orange, or red light in the shape of an engine on your car’s dashboard. Depending on the car, it might include the words “Check” or “Service Engine” inside or next to the engine symbol. The light might be solid or flashing depending on the cause of the check engine light.

FIXD Research Team

At FIXD, our mission is to make car ownership as simple, easy, and affordable as possible. Our research team utilizes the latest automotive data and insights to create tools and resources that help drivers get peace of mind and save money over the life of their car.

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About the Author

FIXD Research Team

FIXD Research Team

At FIXD, our mission is to make car ownership as simple, easy, and affordable as possible. Our research team utilizes the latest automotive data and insights to create tools and resources that help drivers get peace of mind and save money over the life of their car.

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