after i change the 02 sensor on my 2004 maxima what has to ge done machanicly
on 2004 Nissan Maxima

the check engine light comes on and the code says its the 02sensor.

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1 answer 1 comment
After replacing the oxygen sensor you should reset the check engine light. It will not come back on if your problem is fixed. If the MIL returns, I'd suggest you have diagnostics performed to find the specific cause of your malfunction.
I AGREE THESE CAN BE FRUSTRATING ISSUES