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Originally Posted by Irv Mac Dowell
Hello,
My 2001 Pathfinder LE showed a "Check engine Soon" light last August and the O2 sensor was replaced. I inquired about the sensor and was told that there had been no known problems with them, though, to their credit, the dealer replaced it w/o charge. He suggested that I was using fuel that was too high in octane (Please!), and that I switch to a middle grade fuel.
Well now the light's on again after seven months. Anyone know anything about this problem?
Thanks in advance.
Best regards,
Irv
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Nissan has a known flaw in their ECM code that starts to heat the O2 sensors too quickly. If you live in certain climate zones where you get condensation in the exhaust the element will in turn crack in the O2 sensor when this happens. The fix is to actually take the car to Nissan(hopefully still under warranty) and have them flash the ECU with the new code. I had to pay out the ARSE for this cause I was outside the warranty period on mine. Replacing O2's won't help the problem the problem is the ECU.
