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Hey guys, I changed out my 02 sensor last month.

Tiny
ANONYMOUS
  • MEMBER
  • 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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Tuesday, November 13th, 2012 AT 3:03 PM

3 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
What is the code you are getting?
Is the sensor OEM?
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Tuesday, November 13th, 2012 AT 3:39 PM
Tiny
NICKEL7USGMAILCOM
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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
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Tuesday, November 13th, 2012 AT 11:13 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
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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Wednesday, November 14th, 2012 AT 12:44 AM

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