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Oxygen sensors are located in the exhaust system. 4.3L example, one after each bank of cylinders, one before cat and one after cat converter.

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Q: 2003 s10 oxygen sensors where are they located?
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Where is oxygen sensor located on a 2003 s10 pickup?

There are several O2 sensors on that vehicle and they are all threaded into the exhaust system at various points.


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