P0171 Code? Here’s How to Fix It – Quickly and Easily
Dec 31, 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.
P0171 – System Too Lean (Bank 1) - Mechanic Base
Mar 17, 2023 · Several different things could cause this trouble code. Here is what you need to know about the P0171 code. What does the P0171 code mean? What causes the P0171 code? P0171 – …
P0171 & P0174 Trouble Codes - Diagnosis, Causes, Symptoms ... - AutoZone
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.
P0171 Code: System Too Lean – Meaning, Causes, Symptoms & Fixes
Dec 7, 2025 · The P0171 trouble code means your engine is running too lean on Bank 1—meaning there is too much air and not enough fuel. This is one of the most searched and frequently diagnosed …
P0171 Code Meaning, Causes, Symptoms & Tech Notes - Engine-Codes.com
Aug 19, 2024 · The P0171 diagnostic trouble code indicates that the fuel system is running lean on bank 1 of the engine. This means that there is an imbalance in the air-fuel mixture being delivered to the …
P0171 Code Explained: 6 Symptoms, Causes & Pro Fixes to Save You …
A P0171 code signals a lean engine condition, often from vacuum leaks, a dirty MAF sensor, or fuel issues, causing rough idle, misfires, or poor MPG. Diagnosing it like a pro—scanning codes, …
P0171 Code: Causes, Symptoms, and 5 Easy Fixes for System Too Lean ...
Aug 18, 2025 · Simply put, the P0171 Code means your engine is running too lean. That’s mechanic-speak for: too much air, not enough fuel. Bank 1 refers to the side of your engine where Cylinder #1 …
P0171 Code: Air-Fuel Ratio Too Lean (Symptoms, Causes, and Fixes)
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 typically cause …
What Does the Code P0171 Mean and How Do You Fix It?
Jan 6, 2026 · When this fuel trim adjustment exceeds a preset threshold, typically around 25%, the P0171 code is set. “Bank 1” refers to the side of the engine that contains cylinder number one, a …
Code P0171: System Too Lean (Bank 1) – Causes, Symptoms, and Fixes
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 …