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Air Fuel Ratio Sensor Mazda Speed6 Problems
Air Fuel Ratio Tester
P0172 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 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 judges the condition as the fuel injection system malfunction and light up the MIL (2 trip detection logic).