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There will be 4 Oxygen sensors and they ALL are mounted in the exhaust system. 2 near the point where the manifold connects to the headpipe and two more typically after the catalytic converter. The first two are typically the only ones to give trouble. Replace them both at the same time and wait until the engine is cool. Otherwise it's almost a certainty that you'll burn yourself.

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Q: Where is the Oxygen sensor on a 1999 Monte Carlo 3100 V6?
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