Posts Tagged: P0171 code

Understanding the P0171 Code: Causes and Solutions

January 6, 2018

Troubleshooting the P0171 Code: A Comprehensive Guide A P0171 code is common and one that causes a lot of frustration for drivers and DIYers alike. This code indicates a problem related to the fuel system’s air-to-fuel ratio. It’s defined as: P0171 – Fuel Trim System Too Lean (bank 1). That means the oxygen sensor on bank 1 is sensing a lean exhaust mixture. What is the P0171 Code in plain-speak? In simple terms, it means that the engine is getting either too much air and/or too little fuel compared to … Read More