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

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

FIXD Research Team
March 13, 2023

Want to clear your check engine light?

Check out our free guide to see how to turn off your light in seconds.

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
#2	P2006	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
#1	P0400	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
#3	P2006	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
#1	P0400	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
#2	P2006	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
#1	P0400	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
#3	P2006	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
#2	P0140	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
#5	P0400	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
#3	P2006	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
#1	P0400	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
#2	P0400	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
#1	P2006	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
#1	P0400	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
#3	P0400	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
#1	P0299	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
#2	P2463		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.

Clear your check engine light in seconds

The FIXD Sensor and free app tells you why your check engine light is on in easy-to-understand terms and lets you clear it with the touch of a button.

LEARN MORE AND SAVE 67%

We’re here to help you simplify car care and save, so this post may contain affiliate links to help you do just that. If you click on a link and take action, we may earn a commission. However, the analysis and opinions expressed are our own.

Topics

About the Author

Advertiser Disclosure

1. Year

2. Make

3. Model

4. Trim

5. Fuel Type

Great news! FIXD is compatible with your vehicle.

Instantly clear your check engine light!