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Old 10-03-2009, 12:00 PM
Schrade Schrade is offline
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2002 Frontier
 
Join Date: Oct 2009
Posts: 186
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You have a heated O2 sensor (I believe).

On a warmed-up motor, before you start it up again, the PCM checks coolant temps, and if warm, it will or will not heat up the O2 to get a proper reading for the air fuel mix, depending on how it's wired. I'd need to see a wiring diagram.

Post-cat O2's need to be heated because they are so far from the engine, and heat up very slowly, and it would affect proper air-fuel mix.
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