If you use anything else to clean it, you risk damaging its sensitive electronics. Local parts stores sell dedicated MAF sensor cleaners. Unfortunately, it can’t read the air properly if it gets dirty. Your Trax’s MAF sensor is covered with tiny electrodes that can detect how much air is passing through it. If it were running rich, you’d get P0172. When this happens, it can cause your Chevy Trax’s engine to run rich or lean. If it is malfunctioning, your vehicle’s PCM won’t know how much air is entering the engine. The mass air flow sensor calculates the volume of air entering the engine. Mass Air Flow (MAF) Sensor Here are a couple of common MAF sensor styles Once you pull the codes, if it changes to P0174, that’s enough evidence that a faulty O2 sensor was causing P0171 in your vehicle.Start your vehicle and wait for the check engine light to come on.Swap the bank one sensor one oxygen sensor with it’s bank two counterpart.If your Trax has two cylinder banks, you can swap the O2 sensors on each side. If it is malfunctioning, it can cause a false P0171 code. The sensor on or right after the exhaust manifold is typically the sensor that reports the lean condition. The P0171 code is thrown when the bank one sensor one O2 sensor reports that your Trax’s engine is running lean. The linked YouTube video is a phenomenal resource on how to find a vacuum leak. Verify that they aren’t cracked and that they are tightly secured. Look at any hoses or sensors that connect to the intake manifold. Listen and look around your Chevy Trax’s engine bay to see if you can find the vacuum leak. One of the most common causes for the P0171 code to show is a vacuum leak. If there is an air leak after the MAF sensor, it’s not being measured as it enters the intake, which increases the air in the air-to-fuel ratio. Your Trax’s MAF and/or MAP sensors meter the air as it enters the engine. Replacing it requires more digging than most vehicles. On late model versions of the Chevy Trax, the valve covers are a known issue that can cause P0171.ĭetermining if the valve cover is the issue is easy. With that in mind, here are the most common causes: Valve Cover The P0171 code is thrown when something has caused there to be too much air or not enough fuel. Idle Issues– With the air/fuel mixture altered, the vehicle can idle erratically as the computer compensates to keep the engine running.Misfire– If the air-fuel mixture has gotten too far from the 14.7:1 sweet spot, this can cause your Chevy Trax to misfire.Mileage- may or may not suffer depending on how much the air-fuel mixture has changed.For most people, the first sign that anything is wrong is the check engine light. There aren’t usually any drivability issues associated with P0171. If your vehicle has an inline four or six, there’s only one bank of cylinders. You only need to concern yourself with this if there are two cylinder heads. Bank 1īank 1 is the side of your Chevy Trax’s engine with the first cylinder. 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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