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Mazda 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.

Mazda 2 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

 DTC Codes Most Common Causes RepairRepair Cost
#1P0772Faulty transmission control moduleReplace transmission control module Transmission control module: $750 – $810 
Low transmission fluid levelAdd transmission fluid levelTransmission fluid level:$80 – $250
#2P0171Dirty mass airflow sensorClean mass airflow sensorClean mass airflow sensor: $20 – $100
Faulty mass airflow sensorReplace mass airflow sensorReplace mass airflow sensor: $230 – $330
Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasketSeal vacuum leakVacuum leak $100 – $200
#3P0300Spark plug is worn or brokenReplace spark plugsSpark plugs: $66-$250
Ignition coils are brokenReplace ignition coilsIgnition Coils: $230-$640 (some cars require Intake manifold removal)
Spark plug wires are wornReplace spark plug wiresSpark plug wires: $180-$240
Fuel injectors are brokenReplace fuel injectorsFuel injectors: $1500-$1900
#4P0101Engine air filter is very dirtyReplace the engine air filterAir filter $50-70
Mass airflow sensor is dirty or brokenReplace the mass airflow sensorMass air flow sensor $220-320
Catalytic converter is damaged or wornReplace the catalytic converterCatalytic converter $1720-1780

Mazda 3 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

 DTC Codes Most Common Causes RepairRepair Cost
#1P0126Faulty engine thermostatReplace engine thermostatEngine thermostat: $477 – $512
Faulty intake air temperature sensor Replace intake air temperature sensorIntake air temperature sensor: $79-$245
Low engine coolant levelAdd engine coolant fluidEngine coolant: $20 – $123 (cheaper if you do it yourself)
#2P0455Missing, loose, or damaged gas capTIghten or replace gas capMissing or damaged gas cap: $0-$20
Leak in EVAP lineFix leap in EVAP lineEVAP line: $20-$100
EVAP vent control valve is damaged or stuckReplace EVAP vent control valveEVAP vent control valve: $150-$200
EVAP purge volume control valve is damaged or stuckReplace EVAP purge volume control valvePurge volume control valve: $150-$200
#3P2177Faulty fuel injectorsReplace fuel injectorsFuel injectors: $1500 – $1900
Faulty mass airflow sensorReplace mass airflow sensorMass airflow sensor: $230 – $330
Faulty oxygen sensorsReplace oxygen sensorOxygen sensor: $275 – $500 
Air intake leaksFix air intake leaksAir intake leaks:$90 – $125
#4P0442Missing, loose, or damaged gas capTIghten or replace gas capMissing or damaged gas cap: $0-$20
Leak in EVAP lineFix leap in EVAP lineEVAP line: $20-$100
EVAP vent control valve is damaged or stuckReplace EVAP vent control valveEVAP vent control valve: $150-$200
EVAP purge volume control valve is damaged or stuckReplace EVAP purge volume control valvePurge volume control valve: $150-$200
#5P0128Faulty engine coolant thermostatReplace engine coolant thermostatReplace engine coolant thermostat: $40 – $190

Mazda 5 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

 DTC Codes Most Common Causes RepairRepair Cost
#1P0455Missing, loose, or damaged gas capTIghten or replace gas capMissing or damaged gas cap: $0-$20
Leak in EVAP lineFix leap in EVAP lineEVAP line: $20-$100
EVAP vent control valve is damaged or stuckReplace EVAP vent control valveEVAP vent control valve: $150-$200
EVAP purge volume control valve is damaged or stuckReplace EVAP purge volume control valvePurge volume control valve: $150-$200
#2P0101Engine air filter is very dirtyReplace the engine air filterAir filter $50-70
Mass airflow sensor is dirty or brokenReplace the mass airflow sensorMass air flow sensor $220-320
Catalytic converter is damaged or wornReplace the catalytic converterCatalytic converter $1720-1780
#3P0442Missing, loose, or damaged gas capTIghten or replace gas capMissing or damaged gas cap: $0-$20
Leak in EVAP lineFix leap in EVAP lineEVAP line: $20-$100
#4P2177Faulty fuel injectorsReplace fuel injectorsFuel injectors: $1500 – $1900
Faulty mass airflow sensorReplace mass airflow sensorMass airflow sensor: $230 – $330
Faulty oxygen sensorsReplace oxygen sensorOxygen sensor: $275 – $500 
Air intake leaksFix air intake leaksAir intake leaks:$90 – $125

Mazda 6 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

 DTC Codes Most Common Causes RepairRepair Cost
#1P0101Engine air filter is very dirtyReplace the engine air filterAir filter $50-70
Mass airflow sensor is dirty or brokenReplace the mass airflow sensorMass air flow sensor $220-320
Catalytic converter is damaged or wornReplace the catalytic converterCatalytic converter $1720-1780
#2P0421Damaged or worn catalytic converterReplace catalytic converterCatalytic converter $400-$2400
Faulty O2 sensorReplace O2 sensorAir fuel sensor or oxygen sensor $200-$300
Worn spark plugsReplace spark plugSpark plugs: $66-$250
Faulty ignition coilsReplace ignition coilIgnition Coil(s) $230-$640 (some cars require Intake manifold removal)
#3P2187Faulty spark plugReplace spark plug Spark plug: $66 – $250
Exhaust leak Fix exhaust leak Fix exhaust leak: $100-$200 (if welded to repair)
Fuel injector failure Replace fuel injector Replace fuel injector: $1500-$1900
Fuel pump failureReplace fuel pump failureReplace fuel pump failure: $806 – $967
#4P0128Faulty engine coolant thermostatReplace engine coolant thermostatReplace engine coolant thermostat: $40 – $190
#5P0126Faulty engine thermostatReplace engine thermostatEngine thermostat: $477 – $512
Faulty intake air temperature sensor Replace intake air temperature sensorIntake air temperature sensor: $79-$245
Low engine coolant levelAdd engine coolant fluidEngine coolant: $20 – $123 (cheaper if you do it yourself)

Mazda 626 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

 DTC Codes Most Common Causes RepairRepair Cost
#1P0400Stuck EGR valveReplace the EGR valveEGR valve: $250 – $350
Faulty EGR temperature sensorReplace the EGR temperature sensorEGR temperature sensor: $220 – $230
#2P0421Damaged or worn catalytic converterReplace catalytic converterCatalytic converter $400-$2400
Faulty O2 sensorReplace O2 sensorAir fuel sensor or oxygen sensor $200-$300
Worn spark plugsReplace spark plugSpark plugs: $66-$250
Faulty ignition coilsReplace ignition coilIgnition Coil(s) $230-$640 (some cars require Intake manifold removal)
#3P0171Dirty mass airflow sensorClean mass airflow sensorClean mass airflow sensor: $20 – $100
Faulty mass airflow sensorReplace mass airflow sensorReplace mass airflow sensor: $230 – $330
Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasketSeal vacuum leakVacuum leak $100 – $200
#4P0455Missing, loose, or damaged gas capTIghten or replace gas capMissing or damaged gas cap: $0-$20
Leak in EVAP lineFix leap in EVAP lineEVAP line: $20-$100
EVAP vent control valve is damaged or stuckReplace EVAP vent control valveEVAP vent control valve: $150-$200
EVAP purge volume control valve is damaged or stuckReplace EVAP purge volume control valvePurge volume control valve: $150-$200

Mazda B2300 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

 DTC Codes Most Common Causes RepairRepair Cost
#1P0171Dirty mass airflow sensorClean mass airflow sensorClean mass airflow sensor: $20 – $100
Faulty mass airflow sensorReplace mass airflow sensorReplace mass airflow sensor: $230 – $330
Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasketSeal vacuum leakVacuum leak $100 – $200
#2P0455Missing, loose, or damaged gas capTIghten or replace gas capMissing or damaged gas cap: $0-$20
Leak in EVAP lineFix leap in EVAP lineEVAP line: $20-$100
EVAP vent control valve is damaged or stuckReplace EVAP vent control valveEVAP vent control valve: $150-$200
EVAP purge volume control valve is damaged or stuckReplace EVAP purge volume control valvePurge volume control valve: $150-$200
#3P0128Faulty engine coolant thermostatReplace engine coolant thermostatReplace engine coolant thermostat: $40 – $190

Mazda B3000 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

 DTC Codes Most Common Causes RepairRepair Cost
#1P0455Missing, loose, or damaged gas capTIghten or replace gas capMissing or damaged gas cap: $0-$20
Leak in EVAP lineFix leap in EVAP lineEVAP line: $20-$100
EVAP vent control valve is damaged or stuckReplace EVAP vent control valveEVAP vent control valve: $150-$200
EVAP purge volume control valve is damaged or stuckReplace EVAP purge volume control valvePurge volume control valve: $150-$200
#2P0304Spark plug #4 is worn or brokenReplace spark plug #4 Spark plugs: $66-$250
Ignition coils are brokenReplace ignition coilsIgnition Coils: $230-$640 (some cars require Intake manifold removal)
Spark plug wires are wornReplace spark plug wiresSpark plug wires: $180-$240 
Fuel injectors are brokenReplace fuel injectorsFuel injectors: $1500-$1900
#3P0306Spark plug #6 is worn or brokenReplace spark plug #6Spark plugs: $66-$250
Ignition coils are brokenReplace ignition coilsIgnition Coils: $230-$640 (some cars require Intake manifold removal)
Spark plug wires are wornReplace spark plug wiresSpark plug wires: $180-$240
Fuel injectors are brokenReplace fuel injectorsFuel injectors: $1500-$1900
#4P0442Missing, loose, or damaged gas capTIghten or replace gas capMissing or damaged gas cap: $0-$20
Leak in EVAP lineFix leap in EVAP lineEVAP line: $20-$100
#5P0171Dirty mass airflow sensorClean mass airflow sensorClean mass airflow sensor: $20 – $100
Faulty mass airflow sensorReplace mass airflow sensorReplace mass airflow sensor: $230 – $330
Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasketSeal vacuum leakVacuum leak $100 – $200

Mazda B4000 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

 DTC Codes Most Common Causes RepairRepair Cost
#1P0174Dirty mass airflow sensorClean mass airflow sensorClean mass airflow sensor: $20 – $100
Faulty mass airflow sensorReplace mass airflow sensorReplace mass airflow sensor: $230 – $330
Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasketSeal vacuum leakVacuum leak: $100 – $200
Clogged fuel injectorsClean fuel injectorsClean fuel injectors: $50 – $80
#2P0171Dirty mass airflow sensorClean mass airflow sensorClean mass airflow sensor: $20 – $100
Faulty mass airflow sensorReplace mass airflow sensorReplace mass airflow sensor: $230 – $330
Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasketSeal vacuum leakVacuum leak $100 – $200
#3P0401Faulty EGR valveReplace EGR valveEGR valve: $332 to $413
Engine vacuum leakFix vacuum leakVacuum leak: $90 to $125

Mazda CX-5 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

 DTC Codes Most Common Causes RepairRepair Cost
#1P0421Damaged or worn catalytic converterReplace catalytic converterCatalytic converter $400-$2400
Faulty O2 sensorReplace O2 sensorAir fuel sensor or oxygen sensor $200-$300
Worn spark plugsReplace spark plugSpark plugs: $66-$250
Faulty ignition coilsReplace ignition coilIgnition Coil(s) $230-$640 (some cars require Intake manifold removal)
#2P0171Dirty mass airflow sensorClean mass airflow sensorClean mass airflow sensor: $20 – $100
Faulty mass airflow sensorReplace mass airflow sensorReplace mass airflow sensor: $230 – $330
Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasketSeal vacuum leakVacuum leak $100 – $200
#3P0300Spark plug is worn or brokenReplace spark plugsSpark plugs: $66-$250
Ignition coils are brokenReplace ignition coilsIgnition Coils: $230-$640 (some cars require Intake manifold removal)
Spark plug wires are wornReplace spark plug wiresSpark plug wires: $180-$240
Fuel injectors are brokenReplace fuel injectorsFuel injectors: $1500-$1900

Mazda CX-7 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

 DTC Codes Most Common Causes RepairRepair Cost
#1P0300Spark plug is worn or brokenReplace spark plugsSpark plugs: $66-$250
Ignition coils are brokenReplace ignition coilsIgnition Coils: $230-$640 (some cars require Intake manifold removal)
Spark plug wires are wornReplace spark plug wiresSpark plug wires: $180-$240
Fuel injectors are brokenReplace fuel injectorsFuel injectors: $1500-$1900
#2P2187Faulty spark plugReplace spark plug Spark plug: $66 – $250
Exhaust leak Fix exhaust leak Fix exhaust leak: $100-$200 (if welded to repair)
Fuel injector failure Replace fuel injector Replace fuel injector: $1500-$1900
Fuel pump failureReplace fuel pump failureReplace fuel pump failure: $806 – $967
#3P0126Faulty engine thermostatReplace engine thermostatEngine thermostat: $477 – $512
Faulty intake air temperature sensor Replace intake air temperature sensorIntake air temperature sensor: $79-$245
Low engine coolant levelAdd engine coolant fluidEngine coolant: $20 – $123 (cheaper if you do it yourself)
#4P0303Spark plug #3 is worn or brokenReplace spark plug #3Spark plugs: $66-$250
Ignition coils are brokenReplace ignition coilsIgnition Coils: $230-$640 (some cars require Intake manifold removal)
Spark plug wires are wornReplace spark plug wiresSpark plug wires: $180-$240
Fuel injectors are brokenReplace fuel injectorsFuel injectors: $1500-$1900
#5P0401Faulty EGR valveReplace EGR valveEGR valve: $332 to $413
Engine vacuum leakFix vacuum leakVacuum leak: $90 to $125

Mazda CX-9 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

 DTC Codes Most Common Causes RepairRepair Cost
#1P0456Missing, loose, or damaged gas capTIghten or replace gas capMissing or damaged gas cap: $0-$20
Leak in EVAP lineFix leap in EVAP lineEVAP line: $20-$100
EVAP vent control valve is damaged or stuckReplace EVAP vent control valveEVAP vent control valve: $150-$200
EVAP purge volume control valve is damaged or stuckReplace EVAP purge volume control valvePurge volume control valve: $150-$200
#2P0455Missing, loose, or damaged gas capTIghten or replace gas capMissing or damaged gas cap: $0-$20
Leak in EVAP lineFix leap in EVAP lineEVAP line: $20-$100
EVAP vent control valve is damaged or stuckReplace EVAP vent control valveEVAP vent control valve: $150-$200
EVAP purge volume control valve is damaged or stuckReplace EVAP purge volume control valvePurge volume control valve: $150-$200
#3P0016Low oil/dirty oilGet an oil change or add oilEngine oil and filter change $20-$60
Timing chain is stretchedReplace timing chainTiming chain: $1,624 to $1,879
Slipped reluctor ring on the crankshaftReplace reluctor ringReluctor ring $200-$600
#4P0457Missing, loose, or damaged gas capTIghten or replace gas capMissing or damaged gas cap: $0-$20
Leak in EVAP lineFix leap in EVAP lineEVAP line: $20-$100
EVAP vent control valve is damaged or stuckReplace EVAP vent control valveEVAP vent control valve: $150-$200
EVAP purge volume control valve is damaged or stuckReplace EVAP purge volume control valvePurge volume control valve: $150-$200
#5P0430Damaged or worn out catalytic converterReplace catalytic converterReplace catalytic converter: $400-$2400
Broken O2 sensorReplace downstream O2 sensorReplace catalytic converter: $400-$2400
Exhaust leakSeal exhaust leakExhaust leak: $100-$200 (if welded to repair)

Mazda Miata CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

 DTC Codes Most Common Causes RepairRepair Cost
#1P0420Damaged or worn-out catalytic converterReplace catalytic converterReplace catalytic converter: $400-$2400
Broken O2 sensorReplace downstream O2 sensorOxygen sensor replacement: $275-$500
Exhaust leakSeal exhaust leakExhaust leak: $100-$200 (if welded to repair)
#2P0300Spark plug is worn or brokenReplace spark plugsSpark plugs: $66-$250
Ignition coils are brokenReplace ignition coilsIgnition Coils: $230-$640 (some cars require Intake manifold removal)
Spark plug wires are wornReplace spark plug wiresSpark plug wires: $180-$240
Fuel injectors are brokenReplace fuel injectorsFuel injectors: $1500-$1900
#3P0140Faulty oxygen sensorReplace oxygen sensorOxygen sensor: $200 – $300
Faulty mass airflow sensorReplace mass airflow sensorMass airflow sensor: $230 – $330
#4P0106Faulty MAP sensorReplace MAP sensorMAP sensor: $132 to $160
Leaks in air intake systemReplace air intake hosesAir intake hoses: $10 to $120

Mazda MPV CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

 DTC Codes Most Common Causes RepairRepair Cost
#1P0174Dirty mass airflow sensorClean mass airflow sensorClean mass airflow sensor: $20 – $100
Faulty mass airflow sensorReplace mass airflow sensorReplace mass airflow sensor: $230 – $330
Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasketSeal vacuum leakVacuum leak: $100 – $200
Clogged fuel injectorsClean fuel injectorsClean fuel injectors: $50 – $80
#2P0421Damaged or worn catalytic converterReplace catalytic converterCatalytic converter $400-$2400
Faulty O2 sensorReplace O2 sensorAir fuel sensor or oxygen sensor $200-$300
Worn spark plugsReplace spark plugSpark plugs: $66-$250
Faulty ignition coilsReplace ignition coilIgnition Coil(s) $230-$640 (some cars require Intake manifold removal)
#3P0037Faulty heated oxygen sensorReplace heated oxygen sensorHeated oxygen sensor: $200-$300 
Damaged or shorted wiringRepair/replace wiringWiring repair/replacement: $100-$1000 
Faulty ECMReplace ECMECM: $1000-$1200
#4P0171Dirty mass airflow sensorClean mass airflow sensorClean mass airflow sensor: $20 – $100
Faulty mass airflow sensorReplace mass airflow sensorReplace mass airflow sensor: $230 – $330
Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasketSeal vacuum leakVacuum leak $100 – $200

Mazda MX-5 Miata CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

 DTC Codes Most Common Causes RepairRepair Cost
#1P0126Faulty engine thermostatReplace engine thermostatEngine thermostat: $477 – $512
Faulty intake air temperature sensor Replace intake air temperature sensorIntake air temperature sensor: $79-$245
Low engine coolant levelAdd engine coolant fluidEngine coolant: $20 – $123 (cheaper if you do it yourself)
#2P0455Missing, loose, or damaged gas capTIghten or replace gas capMissing or damaged gas cap: $0-$20
Leak in EVAP lineFix leap in EVAP lineEVAP line: $20-$100
EVAP vent control valve is damaged or stuckReplace EVAP vent control valveEVAP vent control valve: $150-$200
EVAP purge volume control valve is damaged or stuckReplace EVAP purge volume control valvePurge volume control valve: $150-$200
#3P0128Faulty engine coolant thermostatReplace engine coolant thermostatReplace engine coolant thermostat: $40 – $190
#4P0421Damaged or worn catalytic converterReplace catalytic converterCatalytic converter $400-$2400
Faulty O2 sensorReplace O2 sensorAir fuel sensor or oxygen sensor $200-$300
Worn spark plugsReplace spark plugSpark plugs: $66-$250
Faulty ignition coilsReplace ignition coilIgnition Coil(s) $230-$640 (some cars require Intake manifold removal)
#5P2177Faulty fuel injectorsReplace fuel injectorsFuel injectors: $1500 – $1900
Faulty mass airflow sensorReplace mass airflow sensorMass airflow sensor: $230 – $330
Faulty oxygen sensorsReplace oxygen sensorOxygen sensor: $275 – $500 
Air intake leaksFix air intake leaksAir intake leaks:$90 – $125

Mazda Protege CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

 DTC Codes Most Common Causes RepairRepair Cost
#1P0421Damaged or worn catalytic converterReplace catalytic converterCatalytic converter $400-$2400
Faulty O2 sensorReplace O2 sensorAir fuel sensor or oxygen sensor $200-$300
Worn spark plugsReplace spark plugSpark plugs: $66-$250
Faulty ignition coilsReplace ignition coilIgnition Coil(s) $230-$640 (some cars require Intake manifold removal)
#2P0171Dirty mass airflow sensorClean mass airflow sensorClean mass airflow sensor: $20 – $100
Faulty mass airflow sensorReplace mass airflow sensorReplace mass airflow sensor: $230 – $330
Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasketSeal vacuum leakVacuum leak $100 – $200
#3P0106Faulty MAP sensorReplace MAP sensorMAP sensor: $132 to $160
Leaks in air intake systemReplace air intake hosesAir intake hoses: $10 to $120

Mazda Protege5 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

 DTC Codes Most Common Causes RepairRepair Cost
#1P0421Damaged or worn catalytic converterReplace catalytic converterCatalytic converter $400-$2400
Faulty O2 sensorReplace O2 sensorAir fuel sensor or oxygen sensor $200-$300
Worn spark plugsReplace spark plugSpark plugs: $66-$250
Faulty ignition coilsReplace ignition coilIgnition Coil(s) $230-$640 (some cars require Intake manifold removal)
#2P0171Dirty mass airflow sensorClean mass airflow sensorClean mass airflow sensor: $20 – $100
Faulty mass airflow sensorReplace mass airflow sensorReplace mass airflow sensor: $230 – $330
Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasketSeal vacuum leakVacuum leak $100 – $200
#3P0300Spark plug is worn or brokenReplace spark plugsSpark plugs: $66-$250
Ignition coils are brokenReplace ignition coilsIgnition Coils: $230-$640 (some cars require Intake manifold removal)
Spark plug wires are wornReplace spark plug wiresSpark plug wires: $180-$240
Fuel injectors are brokenReplace fuel injectorsFuel injectors: $1500-$1900

Mazda RX-8 CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

 DTC Codes Most Common Causes RepairRepair Cost
#1P0410Faulty EGR valveReplace EGR valveEGR valve: $332 to $413
Engine vacuum leakFix vacuum leakVacuum leak: $90 to $125
#2P0171Dirty mass airflow sensorClean mass airflow sensorClean mass airflow sensor: $20 – $100
Faulty mass airflow sensorReplace mass airflow sensorReplace mass airflow sensor: $230 – $330
Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasketSeal vacuum leakVacuum leak $100 – $200

Mazda Tribute CEL – Causes, Diagnostic Codes, Potential Repairs, & Repair Costs

 DTC Codes Most Common Causes RepairRepair Cost
#1P0171Dirty mass airflow sensorClean mass airflow sensorClean mass airflow sensor: $20 – $100
Faulty mass airflow sensorReplace mass airflow sensorReplace mass airflow sensor: $230 – $330
Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasketSeal vacuum leakVacuum leak $100 – $200
#2P0128Faulty engine coolant thermostatReplace engine coolant thermostatReplace engine coolant thermostat: $40 – $190
#3P0174Dirty mass airflow sensorClean mass airflow sensorClean mass airflow sensor: $20 – $100
Faulty mass airflow sensorReplace mass airflow sensorReplace mass airflow sensor: $230 – $330
Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasketSeal vacuum leakVacuum leak: $100 – $200
Clogged fuel injectorsClean fuel injectorsClean fuel injectors: $50 – $80
#4P0301Spark plug #1 is worn or brokenReplace spark plug #1 Spark plugs: $66-$250
Ignition coils are brokenReplace ignition coilsIgnition Coils: $230-$640 (some cars require Intake manifold removal)
Spark plug wires are wornReplace spark plug wiresSpark plug wires: $180-$240
Fuel injectors are brokenReplace fuel injectorsFuel injectors: $1500-$1900

FAQs – Mazda 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 Mazda 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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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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