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U12 2NR »
https://forums.nicoclub.com/u12-2nr-u5979.html
Sun Apr 27, 2003 7:05 am
The check engine light won't always come on with a bad oxygen sesnor. I have yet to experience the check engine light because of a bad oxygen sesnor.
There are many things that can cause a rich mixture.
Get a factory service manual and test your oxygen sensor accordingly, don't buy parts unless you know they're bad. It's just a waste of money.