Mechanics

CHEVY OXYGEN SENSOR REPLACEMENT

2003 Chevrolet Trailblazer

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2003 Chevy Trailblazer 6 cyl Two Wheel Drive Automatic 125000 miles

Where is the 02 Oxygen Sensor located and can this be replaced from the ground vs. Elevated

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John Beesley
January 27, 2008.



It is located on the exhaust manifold. Change it from under the hood.

Dennyp
Jan 28, 2008.
Look on the left side(facing under the hood). There is a heat sheild with approx eight nuts, Try the bottom nut on the sheild first, (8mm or 10mm)If it breaks, stop and bend the sheild out, and try an open end 22mm wrench via wheel well access, insert the wrench behind the sheild. If you can not get it loose you will have to cut the orginal oxy sensor and even break the end of the sensor off to get a socket on it. Make sure you have the correct one on hand.
Install the new one and use the open end wrench behind the heat sheild to tighten.
Autozone has it cheaper then oem. Bosch part #15285.

There is a before converter and after converter sensor, this is for the before sensor, never changed the after.

Tiny
Chevy mike
Feb 2, 2008.