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Old 05-06-2007, 01:19 PM   #1
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Default Running a 4 wire O2 sensor with 1 wire?

Anyone see a problem running a 4 wire with only the signal wire connected? I don't plan on running the 4 wire all the time, I just need to have it on there for a few days and don't feel like running power/ground to it.
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Old 05-06-2007, 02:07 PM   #2
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I think it needs the heater circuit. I tried to test a 4-wire by connecting a voltmeter to it out of the car and using a propane torch to see it react and I got no reaction to the flame. I tested it again in the car and it worked. So I don't know if I was doing something wrong or not.

Easy to test. Plunk it into the car and run a voltmeter to see if it dithers at idle.

Cliff Knight on has some information about testing and how they work on a webpage somewhere.
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