Dec 31, 2025 · Learn what's causing your engine to run too lean and triggering the P0171 code, and how to fix it before it leads to costly repairs.

Mar 17, 2023 · What does the P0171 code mean? The P0171 code indicates that the oxygen (O2) sensor on bank 1 sent a signal to the engine control module that the air-fuel mixture is too lean to be …

P0171 or P0174 readings indicate too lean of a system in one of your cylinder banks. Learn common causes and solutions to these trouble codes.

Aug 19, 2024 · What does the OBDII code P0171 mean? Code P0171 means that the oxygen sensor in bank 1 has detected too much oxygen in the exhaust relative to the fuel being injected into the …

On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1. The P0171 is one of the more common trouble codes. This code is triggered by the first downstream (front) O2 sensor.

Jul 15, 2024 · Everything about P0171 codes, including causes, symptoms, repairs, and most vulnerable vehicles, is detailed below. Possible Causes of P0171 & Their Repair Costs

Did your vehicle register error code P0171? Find out the meaning, symptoms, causes, diagnosis, and repair procedures.

A P0171 code is set by your vehicle’s powertrain control module (PCM) when it detects that the air-to-fuel ratio of your vehicle is too lean. This means that the PCM is relaying that the engine...

When the P0171 code sets, the oxygen sensors are detecting too little oxygen in the exhaust (running "lean") and the control module is adding more fuel than normal to sustain the proper air/fuel mixture.

Struggling with the P0171 code? Explore its causes, symptoms, and effective repair solutions to ensure your vehicle's air-fuel mixture is balanced and efficient.