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 · To fix the P0171 code, you need to check and repair vacuum leaks, repair low fuel pressure, or replace any faulty sensor that can cause a lean mixture on bank 1.

A P0171 code, “System Too Lean (Bank 1),” means your engine is running with too much air or too little fuel, triggering the check engine light and risking damage if ignored. This guide covers …

4 days ago · The P0171 trouble code means the engine control module has detected a lean air-fuel mixture on Bank 1, where the engine is getting too much air and not enough fuel. This …

Jan 10, 2025 · With less fuel delivered than required, the engine runs on a lean air-fuel mixture, which commonly triggers code P0171. Fix: Try using a fuel injector cleaner as a first step.

Oct 16, 2025 · In this article, we’ll explore the common causes of code P0171 and provide you with the knowledge you need to diagnose and fix the problem before it causes serious damage …

Aug 18, 2025 · Simply put, the P0171 Code means your engine is running too lean. That’s mechanic-speak for: too much air, not enough fuel. Bank 1 refers to the side of your engine …