Is there a polarity on an O2 sensor?
#1
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Is there a polarity on an O2 sensor?
Ripped the O2 sensor wiring off last night wheeling. I thought they operate on resistance (doesn't matter what orientation the wires are in) so I just hooked it back up. I still have a check engine light. There are 2 wires coming off of it, both are white. On the wiring harness they are black and grey. Any ideas?
#3
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Join Date: Jul 2012
Location: SD
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Year: 1998
Model: Cherokee
Engine: 4.0
Is this for the '99 you have listed? If so, should be more than 2 wires. '99 would have a heated O2 sensor. Polarity wouldn't matter for the heater wires.
#4
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Odd, i'll go out and grab a pic. This is the O2 sensor after the cat, I guess I didn't think about it before but there are more wires on the Jeep wiring harness, but only two on the O2 sensor harness.
#6
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Alright, O2 sensor side, gray and black wires to two white wires
And the other side definitely has four wires, pretty odd.
Here's a shot a bit further away
And the other side definitely has four wires, pretty odd.
Here's a shot a bit further away
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#8
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#10
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Yeah I just went and checked, there's definitely holes for the other 2 wires in the O2 sensor, but no wires coming out. I cut the wires I spliced back together, hopefully nothing was damaged being mismatched like that.
#11
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New O2 sensor is in. No difference in how it runs either lol I guess I'll see if my gas mileage changes
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