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For a lot of engines (as long as they are not inlines), have 2. One just after where the exhaust manifold pipes meet up with the collector tubes. there is usually 3, one in each cylinder bank upstream from the cat and one after the cat if there is two cats, like the 96 and up full size V8, there are 4 total sensors

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Q: How many O2 sensors does a 1998 Chevy S10 have?
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