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There are 3 O2 sensors on the GM pickup in 97. They are all heated (means they are more expensive and are 3 or 4 wires). There is one on each side of the motor, just below each manafold, and then there is one after the converter (both sides combine at the converter). The converter is located on the passanger side of the truck, at about the main front pass door.

Sorry but majority of these trucks actually have four, depending on the exhaust system design, but most 96 to 99s have four, two per side, two being upstream (before converters) and two being downstream (after converters)

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Q: Where is the oxygen sensor located on 97 Chevy 1500 truck?
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