The GMC Envoy’s oxygen sensor is a critical component for your vehicle. The oxygen sensor monitors the amount of unburned oxygen that is in the exhaust as the exhaust exits the engine. This is an important process for the vehicle as it controls the fuel mixture and regulates the Envoy’s engine performance and emissions. When the Envoy’s oxygen sensor begins to fail or is completely bad, the vehicle's drivability will be affected and you will notice increased fuel consumption. Replacing a bad or failing oxygen sensor is crucial to your vehicle’s performance.
Turn the Envoy’s engine off and allow the vehicle to cool for 10 minutes. The oxygen sensor is easiest to replace while the engine is still warm.
Open the hood of the Envoy using the hood-release lever in the vehicle. Locate the oxygen sensor on the exhaust manifold. If needed, refer to the Envoy owner’s manual for exact location and a picture.
Loosen and remove the oxygen sensor by using a 22 mm socket wrench or a special oxygen sensor socket. Twist the socket wrench counterclockwise until the sensor is loose enough to remove.
Connect the new oxygen sensor by plugging it into the connector on the exhaust manifold. Close the hood of your Envoy and pull up to ensure the hood latches shut.
