Jan 10, 2025 · The P0171 code indicates a lean fuel mixture in the engine’s bank 1, which can cause reduced power, rough idling, and hesitation during acceleration. Common causes of the P0171 code include vacuum leaks, faulty oxygen sensors, clogged fuel filters, and malfunctioning mass airflow sensors or fuel injectors.

Mar 17, 2023 · What does the P0171 code mean? The P0171 code indicates that the oxygen (O2) sensor on bank 1 sent a signal to the engine control module that the air-fuel mixture is too lean to be corrected. The O2 sensors have the ability to correct a fuel mixture of +-15%.

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.

May 25, 2022 · “Code P0171 – system too lean bank 1” means there is too much oxygen or too little fuel in the exhaust, which is referred to as a “lean” condition, or a lean or “low fuel trim” code. This can be caused by something like a disconnected hose or vacuum leak, which means there’s more air than usual, or because your fuel system is weak.

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 engine, with more air than fuel.

DTC P0171 refers to an imbalance in the amount of air and fuel entering the engine as the vehicle operates. Specifically, the “System Too Lean” description indicates there’s more air or less fuel in the system than should typically be there.

Jul 23, 2023 · 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 highly likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replace the air filter and clean the Mass Air Flow (MAF) Sensor.

Sep 10, 2024 · Code P0171 is all about your engine running lean, which means there’s too much air and not enough fuel in the combustion mixture. Think of it like making a sandwich with too much bread and not enough filling – it just doesn’t work right. This imbalance can cause all sorts of problems, from poor fuel economy to potentially damaging your engine.

Jan 6, 2018 · 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 the ideal air-to-fuel ratio of around 14.7:1 (air-to-fuel ratio).

When a vehicle has the fault code P0171, it means that computer can no longer automatically adjust the mixture between air and fuel. Code P0171 applies to 4-cylinder engines (Bank 1) as they generally have only one bank. If you have a V6 or V8 engine you can also get a P0174 code which refers to Bank 2.