The mystery of the O2 ghost sensor

complete_loser

New member
Heres my strange problem.

I bought a 93' yj. It was pretty rough around the edges, and in the middle also.

First thing I did was run codes when I got it. It was the usual list of 24, 25, 12 and 55.

No problem. So I fixed them, and the trouble codes never came back.

When I changed to a header, I noticed the O2 sensor was still in the manifold, but wires were cut.
So, not wanting loose wires hanging around, I found them (the connector was cut off and wires tucked into harness) and soldered on a new connector and installed a new O2.

But then the mystery hit me. Why did I not have an O2 code in the first place? And I still dont to this day.

:???:
 

Maybe that old o2 is not connected all the way through. Hence the new o2.
 
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