OBD1 S50 oxygen sensor wiring pinout

[e30austin]

Got a '89 325i in with an S50 that came from a junk yard. Whatever dick cheese that pulled the engine, decided it was easier to cut the wiring harness for the oxygen sensor, rather than just disconnecting it...

I have robbed/installed another oxygen sensor connector off another 24v OBD1 harness, but the colors didn't match up quite the same (one or two were different). The car is now throwing a code 13, oxygen sensor control, code, so I'm guessing it's something to do with the connector I installed. Voltage from my Snap On Ethos is -.14 volts on one, and between -.05 and -.09 on the other.

Additionally, when under full throttle, once the engine hits 4,000 RPM, it's like it has completely hit a wall and stops unless you feather it. I have a feeling that the two items are related.

So, if anyone has a pinout chart for an oxygen sensor on an OBD1 24v engine, I would greatly appreciate it. Thanks!

Update: thanks for the pinout, "TheRob"! Got it handled.

[TheRob]

Does this help? I used this when I had to wire mine because someone just cut the harness when they pulled it. Just like your situation. This was the closest thing I could muster for a pin out from AllData.


Untitled by Bob Terwiliger, on Flickr

Untitled by Bob Terwiliger, on Flickr

[e30austin]

That's certainly more than I have now! Thank you.

[ZekeTheSneak]

Most if not all O2 heaters don't work correctly due to some back feeding issue. Just Google that shit as well. Good luck Austin.