Mechanics

NISSAN ALTIMA SENSOR PROBLEM

2000 Nissan Altima • 90,000 miles

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
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Guest
November 13, 2012.



What is the code you are getting?
Is the sensor OEM?
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KHLow2008
Nov 13, 2012.
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
Nickel7usgmailcom
Nov 13, 2012.
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.

KHLow2008
Nov 14, 2012.

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