HEY GUYS I CHANGED OUT MY 02 SENSOR LAST MONTH ...

2000 Nissan Altima

Tiny

Anonymous

November, 13, 2012 AT 3:03 PM

Hey guys, I changed out my 02 sensor last month after getting the "o2 sensor upstream" engine code, what would cause the engine light to return with the same code after a few weeks. I ve considered vacuum leaks but is there anything further after that? Thanks

FOUND 378 RELATED QUESTIONS

3 Answers

Tiny

KHLow2008

November, 13, 2012 AT 3:39 PM

What is the code you are getting?
Is the sensor OEM?

Tiny

nickel7usgmailcom

November, 13, 2012 AT 11:13 PM

P0420 - it was a direct fit but not oem. The code was reset and was off for over 100 miles before popping back up reread same code p0420. Thanks for the quick reply

Tiny

KHLow2008

November, 14, 2012 AT 12:44 AM

P0420 - 3 way Catalyst malfunction.
The catalytic converter seems to be faulty.

This is not an O2 sensor fault and when the MIL comes on, it does not necessarily mean a component in the circuit is faulty. It could be wiring or control fault.

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