Why does my 99 XJ have a 3 pin connector? I've searched local stores and online and every O2 sensor I've found for a 99 are all 4 pin connector. My local store even tried searching a few years newer and older with 4 and 6 cylinders motors and they are all 4 pin connectors. I'm trying to clear a no voltage code and found the upstream wires melted. Anyone know where I can get a 3 pin O2 sensor?



Thanks,

 

87-90 Titinia Renix 02 sensors are three wire, but the connector looks different. You wouldn't want to go there anyway as your PCM wouldn't understand that signal anyway. Maybe your harness is hacked? That three wire on a 99 likely goes to something else. I wouldn't envy you the task of finding the pinout on your PCM and running new wires. Hope something easier turns up!

A ways into this thread, I think Mike gets into HO Zerconia 02 sensors, might help> http://www.naxja.org/forum/showthrea...ht=sensor+test)

 

That's probably the CPS pigtail connector.