2023年3月17日 · A P0171 code appears in the engine control unit when the oxygen sensor on bank 1 recognizes too lean of an air-fuel mixture for the sensor to correct it. Several different things could cause this trouble code.

2025年1月10日 · Your vehicle’s onboard computer has triggered the P0171 code, indicating a lean fuel mixture on bank 1 of the engine. Now, it’s time to diagnose the issue. Start by performing a thorough fuel system inspection to identify any leaks, blockages, or malfunctions.

2022年5月25日 · What Does Code P0171 mean? “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.

When your powertrain/engine control module receives a reading that indicates there’s too much oxygen and the ratio is incorrect, it sends an error code P0171 or P0174. Depending on the problem, it may send both codes if the issue is causing a lean condition on both engine banks.

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.

2024年7月15日 · A P0171-associated check engine light comes on when the powertrain control module (PCM) or engine control module (ECM) detects the engine isn’t getting enough fuel. For most gasoline engines, this means using 14.7 parts of air for every 1 part of fuel.

2025年1月27日 · Ignoring a P0171 code could worsen problems over time and impact overall drivability. What are the common causes of a P0171 code? A P0171 code indicates that the engine is running too lean on Bank 1, which means there is insufficient fuel or excessive air in the combustion mixture. Several factors can trigger this issue.

2024年10月21日 · What does the P0171 code mean? The P0171 code indicates that the engine control module (ECM) has detected a lean condition in Bank 1 of your vehicle. Essentially, this means there’s an imbalance between air and fuel entering the combustion chamber. When too much air enters and not enough fuel is supplied, it disrupts optimal engine performance.

2021年7月10日 · The OBDII trouble code P0171 - System Too Lean (Bank 1) means that the engine air-fuel mixture is too lean, or there is too much air and too little fuel. Driving a car with the code P0171 can cause more damage to the engine over time, as when the engine runs lean, the combustion temperature is higher.

Basically this means that an oxygen sensor in bank 1 has detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1. The P0171 is one of the more common trouble codes. This code is triggered by the first downstream (front) O2 sensor.