![]() ![]() You probably know that the answer the questions is - no! A P0171 or P0174 lean code with an O2 sensor reading lean all the time mean - well, several things. Replacing the powertrain control module. ![]() How do I fix P0171 System Too Lean Bank 1? If the check engine light comes back on with code P0171 continue the diagnostic process. Reinstall the mass air flow sensor and clear the check engine light using FIXD. Remove the mass air flow sensor and clean the sensor using mass air flow cleaner or contact cleaner. What causes a bad O2 sensor on a Chevy?.What is the OBDII code on a Ford Focus?.What causes the p0171 code on a Ford Focus?.How do I fix P0171 System Too Lean Bank 1?.
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