Quote:
Originally posted by stevebfl
Fifty percent IS a fault code on a warm motor. If you have to rev a car with a heated O2 sensor, it is real likely the heater circuit isn't working. Once warm the O2 sensor should never cool until shut down.
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Hmmmmm......You know, Steve, that is an interesting thought. I had not considered the heater circuit. I'll check it with the ohm meter it and see if it's open. It would be ironic if it was the 02 sensor all this time.
Thanks
OK, I checked the heater wires going into the O2 sensor. Resistance is almost none...2 ohms. It's the same as an old sensor I had lying around and checked for comparison. Battery voltage is going to the O2 sensor when the engine is running.
That means the O2 sensor heater circuit is good?