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Sorry if I'm being dense here, but I just cannot find the upstream sensor. I can't see anything that appears to be plugged into the exhaust manifold--can you see it from above on the 2.4? Or can it only be seen with the car up in the air?
I gather from another thread that the downstream o2 is only related to emissions, so is it a nonissue, or does it need to be disconnected if the upstream is?
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