2000 Nissan Altima Repair Question
Topics covered: Sensor, Engine, Catalytic converter.
Mileage: 90,000 miles.
Mileage: 90,000 miles.
Asked on November 13, 2012
Nissan Altima Sensor Problem
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
Asked by (pending member)Answer
Replied on November 13, 2012
What is the code you are getting?
Is the sensor OEM?
Replied on November 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
Replied on November 14, 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.