![]() 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 Equinox 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 Equinox’s engine is running lean. 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 Equinox’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 Equinox’s MAF and/or MAP sensors meter the air as it enters the engine. With that in mind, here are the most common causes: Vacuum Leaks ![]() 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 Equinox 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 Equinox’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. ![]()
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