There should be 2,both are in the exhaust 1 behind the cat.converter & 1 upstream
if the truck has dual exhaust it may have more than the 2.if your reading codes it will
list them as bank 1 sensor 1 or 2. sensor 1= upstream 2 = behind cat
good luck
Majority of GM that year is on the exhaust manifold or pipe coming off the manifold before it goes into the catalytic converter. Kind of looks like a spark plug with a wire coming off of it screwed into the pipe.
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