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Old February 16th, 2011, 22:07
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Ecomike Ecomike is offline
NAXJA# 2091
Join Date: Dec 2006
Location: MilkyWay Galaxy
Posts: 15,337
Re: Testing Jeep O2, Oxygen sensors

Originally Posted by xjtrailrider View Post
Mike, my 12 volt supply to the O2 heater only works when the engine is running. Shouldn't have 12-14v when the key is in the running position? I have a good ground and i have a 5v supply to the O2 sensor side but my heater supply is only working when running.

1990, AW4, NP231
IIRC, mine had 12 volts in the run position, engine off, but I am not 100% sure. But mine are 87 and 89. As long as it has power with the engine running, I would not be concerned.
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