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 …

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.

Feb 27, 2025 · Since a P0171 code means the engine is running too lean, diagnosing the problem involves checking for air leaks, fuel delivery issues, and sensor malfunctions. Below is a step …

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.

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 …

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 …

Dec 5, 2025 · The P0171 designation specifically translates to “System Too Lean, Bank 1,” indicating that the engine’s computer, or Powertrain Control Module (PCM), has detected an …

P0171 Code Symptoms, Causes, Diagnosis, Repair & Cost Overview Quick Summary P0171 = “System Too Lean Bank 1” – the ECM detects excess air vs. fuel on the first cylinder bank. …