It also throws the code P0171 to let you know it has done this. The vehicle’s PCM will add more fuel to the mixture to bring the air-fuel mixture where it needs to be for optimal combustion. The code is thrown when the oxygen sensors detect the air-fuel mixture is “lean” (too much air or not enough fuel). Powertrain control module– Takes info from these sensors and uses it to adjust the air/fuel ratio.Their job is to meter the air as it enters the engine. MAF or MAP sensor– Depending on your Trax’s model year, it can have a mass airflow sensor or manifold absolute pressure sensor (or both).O2 sensors– Oxygen sensors meter the exhaust and report the oxygen content to the powertrain control module.Your vehicle’s fuel trim system manages the air/fuel ratio and adjusts it when the powertrain control module determines it’s necessary (it can range anywhere from 12.0:1 for power and 16.0:1 for economy). The ideal air/fuel ratio is 14.7:1 (14.7 parts air to one part fuel). P0171 is a generic code, meaning it has the same definition for the Chevy Trax as any other vehicle. P0171 Definition: Fuel Trim System Lean Bank 1 The common P0171 repairs are usually simple. It varies, but the most common repairs are usually under $200. Rarely, but driving with P0171 can sometimes damage other components. DefinitionĬheck engine light, decreased fuel economy, misfire, hard to find idle.ĭirty MAF sensor, vacuum leak, O2 sensor. The most common causes of P0171 are a bad Oxygen sensor, a vacuum leak, or a dirty MAF sensor.

It’s not the most complicated OBDII trouble code to diagnose. It’s the most common air/fuel mixture-related code. It indicates that your Chevy Trax is running lean on the bank one side. One of the most common trouble codes with the Chevy Trax is P0171.

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