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 …

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 · 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 …

May 25, 2022 · After grabbing and connecting your handy OBD II scan tool or code reader, you find out you have a P0171 code. We’ll review what this code means, how serious it is, and …

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 …

Jul 10, 2021 · Q: What could cause the code P0171 on 2002 Toyota Corolla? A: In the 2002 Corolla, the code P0171 is often caused by a bad or dirty mass airflow sensor or vacuum leaks.

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 …

5 days ago · 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 …

What Is a P0171 OBDII Error Code? A P0171 code indicates there is a fuel/air mixture problem on Bank-1 of the engine. A 4-cylinder engine will only have 1-Bank, while a V6 or V8 engine will …