In my quest to get a new O2, I've discovered mine is a 3-wire heated one thats wired into the ECM. This is not a factory TPI but a conversion from my TBI in my '94 Silverado.
Anyone else have a 3-wire heated O2 sensor and know what the AC Delco part# is for it?
Thanks

 

You can browse the GN web page as well.

I used an AC Delco AFS-74. I believe it was a common part on a 95 S10 with a 4.3.

It depends what plug you have on your harness. There are a few numbers close to the 74, like 72, 73 which have different ends on them. Same sensor.

FYI: There was never a heated O2 as a factory sensor in a TPI.

Mark.

 

Thanks for the info Mark, I was suspecting the AFS74 since that was original equip on the original TBI motor in the truck and I remember when I installed the wiring harness, the old one fit in the harness connector ok, but I replaced it with the O2 sensor that came with the conversion kit.
Yes, I quickly discovered that there were no 3-wire O2s for the TPI when I started looking for a replacement via several AC parts vendors.
Thanks