2002 Nissan maxima se, check engine light on and codes say all 4 O2 sensors are messed up..problem is I replaced 2 of them a year ago. Any ideas ? Can't pass my emissions test until the SES light is off....
It's not feasible that all four failed at once. Something is affecting their output such as a low voltage input. Check power inputs and supplies, connectors and wiring.
Use this site for probable causes --- http://engine-codes.com/
It ended up being a blown fuse...once that was fixed it turned on again and was coding the evap system... Mechanic wanted to charge a fortune so did some research, had the codes cleared and bought a new gas cap, so far so good. Hope it stays off so I can get e-test tomorrow
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