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 …

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 …

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.

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 · What Does Code P0171 Mean? OBD-II Trouble Code P0171 Description. A P0171 code indicates the air-fuel ratio entering your engine block is not ideal. Two main issues …

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.

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 …

Aug 20, 2023 · Most cases involved dirty or faulty MAF sensors causing incorrect air measurement and lean codes. Vacuum leaks were a common cause, often found via smoke …

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 …