Jan 10, 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.

Aug 19, 2024 · The P0171 code means that more air than gasoline is detected in the exhaust gases exiting the combustion chamber. If the P0171 is set in along with the P0174 code, it is highly likely …

Diagnostic trouble code (DTC) P0171 stands for “System Too Lean” (Bank 1). The air-fuel mixture with too much air and little gasoline could trigger this trouble code. Lean Mixture = Too much air, not …

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 the P0171 …

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.

Oct 16, 2025 · OBD-II Trouble Code P0171 Description. A P0171 code indicates the air-fuel ratio entering your engine block is not ideal. Two main issues typically cause this code. There is either too …

Dec 16, 2025 · Stop guessing why your engine is running lean. Our expert guide details all P0171 causes, symptoms, and DIY steps to clear the code permanently.

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 where Cylinder #1 is located. If …

Apr 11, 2025 · Code P0171, officially designated as “System Too Lean (Bank 1)” by the Society of Automotive Engineers, signals that your engine’s air-fuel mixture contains too much air and …

May 10, 2025 · Learn what fuel trim system lean and OBD-II code P0171 mean, their symptoms, causes like vacuum leaks or low fuel pressure, and how to diagnose and fix a lean air-fuel ratio issue …