The Engine Control Module ( ECM) calculates the necessary compensation to correct the offset between the actual and the theoretical ratios.įastpictureviewer codec pack 3.8 windows add-in crack. P0171 Mazda DescriptionWith 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. Engine Light ON (or Service Engine Soon Warning Light).The amount of mixture ratio compensation is too small. When is the code detected?- Fuel injection system does not operate properly. If the problem persists the front oxygen (O2) sensor may need to be replaced. If there are no intake leaks, the next step is to replace the air filter and clean the air flow meter. Tech notesIf the P0171 is combined with the P0174 code, it's very likely that the problem is caused by an intake leak. ![]() Incorrect Positive Crankcase Ventilation (PCV) hose connection.Repair Difficulty Level: 3/3 Possible causes
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