'The P0171 indicates a lean air-fuel ratio. It could sets by several different reasons i.e.: dirty, restricted injectors, bad or dirty Mass Air Flow Sensor, disconnected or leaking vacuum hoses, leaking intake manifold gasket, leaking exhaust, O2 sensor etc.
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Engine-CodesOBDII Code List P0174 MAZDA
Repair Difficulty Level: 3/3
P0174 MAZDA Possible Causes
How do I fix code P0174 MAZDA
Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.
P0174 MAZDA Tech NotesIf the P0171 is combined with the P0174 code, it's very likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replace the air filter and clean the air flow meter. If the problem persists the front oxygen (O2) sensor may need to be replaced.Cost of diagnosing the P0174 MAZDA codeLabor: 1.0The cost of diagnosing the P0174 MAZDA code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.When is the P0174 MAZDA code detected?- Fuel injection system does not operate properly.![]() P0174 MAZDA Possible Symptoms
P0174 MAZDA MeaningWith the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the theoretical mixture ratio based on the mixture ratio feedback signal from the heated oxygen sensors 1. The Engine Control Module (ECM) calculates the necessary compensation to correct the offset between the actual and the theoretical ratios.In case the amount of the compensation value is extremely large (The actual mixture ratio is too lean.), the ECM judges the condition as the fuel injection system malfunction and light up the MIL (2 trip detection logic). P0174 MAZDA More InformationNeed more information on how to fix the P0174 MAZDA code?Get Access to Factory Service Manuals Related Information![]() Comments are closed.
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