What does the Buick trouble code P0171 mean?

1 Answers
DiJulianna
07/30/25 1:54am
The Buick trouble code P0171 indicates a lean fuel mixture in the fuel regulation system. Below is a detailed explanation of the P0171 trouble code: 1. Cause of the issue: The front oxygen sensor detects the oxygen content in the engine exhaust and sends feedback signals to the ECU. The ECU then adjusts the fuel injection duration to maintain the air-fuel ratio near the optimal level. If the ECU detects that the oxygen sensor signal voltage remains below 0.45V for an extended period, this trouble code will appear. 2. Solution: Check if low-quality fuel has been used; if so, replace it and clean the fuel system as necessary. Inspect for mechanical issues causing compression leaks and misfires, and check the ignition system for faults. If the issue persists or other faults are present, consult a professional technician. Always refuel at reputable gas stations and follow the vehicle's maintenance schedule as outlined in the owner's manual.
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