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There are four heated oxygen sensors on the 1996 and up NorthStars. One in each exhaust manifold, and just before and after the catalytic converter. The sensor in the right side exhaust manifold is the hardest to see and service, it's behind the engine up against the bulkhead. If the engine has an AIR system that also helps keep it hidden.

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Q: How many oxygen sensors does a 2002 Cadillac Northstar engine require?
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