How to resolve the P0171 fuel system too lean issue in the Buick Excelle?

1 Answers
LeMaci
07/29/25 10:26am
It is recommended to immediately check the intake system for any air leaks and promptly locate the nearest repair facility for further inspection. The P0171 fuel system too lean code indicates that the engine's oxygen sensor has detected incomplete gasoline combustion, with insufficient fuel and excessive air. Continued driving under this condition may result in reduced acceleration, increased fuel consumption, and in more severe cases, engine stalling. Possible causes for the P0171 fuel system too lean condition include: 1. Fuel contamination; 2. Missing, clogged, or leaking exhaust system components; 3. Faulty fuel injector; 4. Insufficient fuel in the tank; 5. Low fuel pressure; 6. Vacuum leaks in the intake manifold, throttle body, or injector O-rings.
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