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Hello all. I have a 2007 versa S. I’ve owned it for a while and love it. I’m at 158k. I believe i’m having an O2 sensor issue. My question is how do I know if it’s the upstream or down stream sensor?
 

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Upstream will affect engine performance since it sets the injectors. Down stream will not affect performance since it simply reports cat condition.

You can have error codes and the light not be on, they will tell you which sensor too.
 
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