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How many oxygen position sensors does a 2002 Chevy Trailblazer have Auto store told me 2 mechanic told me 1?

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βˆ™ 2010-01-29 21:51:10

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Just look and count them. They will be located on the exhaust system. Start at the exhaust manifold and go backward. There are upstream and downstream O2 sensors. Upstream is located before the catalytic converter and downstream is located after.

Yes, there are 2 - an upstream and a downstream, but they are pretty difficult to count unless you know what you are looking for and where to look for them. The upstream sensor is located on the exhaust manifold on the passenger side - if you look down from the top of your engine on the passenger side, you can see it on the side near the bottom of the engine. The downstream sensor is located around the catalytic converter (in the middle, under the vehicle).

2010-01-29 21:51:10
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