The Location Of O2 Sensors In A 1997 Chevy Blazer

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By Baptist Johnson

The oxygen (O2) sensors in a 1997 Chevrolet Blazer are an important component of the exhaust system, working to manage the balance between oxygen and fuel. A faulty oxygen sensor can throw off the proper fuel-to-air ratio, which can cause serious problems with your vehicle. One indicator of a problem with your oxygen sensors is the illumination of your check engine light. To replace a faulty oxygen sensor, you must first locate it.

Mute the speaker Listen to this using a male or female voice M/F Park your Chevrolet Blazer in a safe location on level ground. Engage the parking brake or apply tire stops to the wheels of the vehicle to prevent the vehicle from rolling while you are working on the oxygen sensors. Raise the vehicle using a car jack. Place jack stands under the axles to keep the vehicle elevated.

Mute the speaker Listen to this using a male or female voice M/F Crawl under the vehicle. Find the exhaust pipe and follow the exhaust pipe until you reach the catalytic converter. You should be able to identify the catalytic converter as an enlarged portion of the exhaust pipe just below the rear seating area. The catalytic converter is cylindrical and approximately 6 inches in diameter.

Mute the speaker Listen to this using a male or female voice M/F Inspect the surface of the catalytic converter and take note of two sets of wiring harnesses around the catalytic converter that contain several visible wires. These wiring harnesses hold both of the oxygen sensors on your Blazer. One of the wiring harnesses is along the exhaust pipe before the catalytic converter--this is your upstream sensor. The other wiring harness is along the exhaust pipe after the catalytic converter--this is your downstream sensor.

Mute the speaker Listen to this using a male or female voice M/F Always wear gloves and protective eye wear when performing maintenance to your vehicle.

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