P0171 Code: System Too Lean (Bank 1) Causes & Fixes
If you've encountered the diagnostic trouble code (DTC) P0171 - System Too Lean (Bank 1), you're not alone. This common error code often appears when something is amiss with your vehicle's air-to-fuel ratio. But what exactly does it mean? How can you diagnose and fix it? In this article, we'll break down everything you need to know about P0171, ensuring it's easy to understand, even if you're not a car expert. What Does P0171 Mean? The P0171 code indicates that your vehicle’s engine control module (ECM) has detected a lean condition in Bank 1. A lean condition occurs when there’s too much air and not enough fuel in the air-fuel mixture. • Bank 1 refers to the side of the engine where cylinder 1 is located. • System Too Lean means the oxygen sensor has identified that the mixture of air and fuel is off balance. This imbalance can lead to reduced performance, increased emissions, and potential damage to your engine over time if not addressed promptly. Co...