What does the trouble code P0171 signify?


Quick Answer

The trouble code P0171 means that the engine air-to-fuel ratio contains too much oxygen and too little fuel. Driving without correcting the problem creates a higher combustion temperature, which can eventually cause more damage. Quite a number of issues may cause the engine to run lean.

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Full Answer

Symptoms that may accompany the P0171 code problem include engine problems such as reduced power, rough idling, hissing sounds, stalling and running hot. The driver may have trouble starting the engine as well. Some possible causes of the irregular air-to-fuel problem may include vacuum leaks, a malfunctioning solenoid, a bad oxygen sensor, low fuel pressure or a clogged catalytic converter.

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