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I got a check engine diagnostic it said that o2 sensor 2 had a bad circuit. Which o2 sensor is that? The one on the exhaust mainifold or the one from the cataylic converter?
Simple start at the cylinder head and the follow the exhaust. They are number in order so the first one in the manifold and the second is in/after the cat.
upstream usually goes bad first, since it sees the most grit and grime from your engine. it's the one on the manifold most likely. (i work at autozone and see a lot of it...)
Help!
