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post #1 of 3 Old 01-07-2019, 05:08 PM Thread Starter
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Just joined. O2 sensor problem.

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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post #2 of 3 Old 01-07-2019, 05:25 PM
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Quote:
Originally Posted by Hhenderson View Post
Hello all. I have a 2007 versa S. Iíve owned it for a while and love it. Iím at 158k. I believe iím having an O2 sensor issue. My question is how do I know if itís the upstream or down stream sensor?
You don't mention if you are getting any error codes, but the information on the link below may give you some ideas as to what the trouble can be:



https://repairpal.com/obd-ii-code-p2...ystem-too-rich
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post #3 of 3 Old 01-07-2019, 09:59 PM
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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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