An O2 sensor simulator may be the easiest solution, IMO. The only downside is it not being stealth enough for obvious reasons but the computer will be clueless if done correctly.

 

Well... Bluecar5556... It's off topic, but you have your eyes wide open!!
You're talking about "dépopulation".

best regards Ton

 

A premade purchased O2 simulator online that is.

 

if your truck is an 96, it should have 1 o2 sensor on each header, then one on the exhaust pipe right after the cat. pre 96 only has 1 on each header. so id crawl under your truck and look behind your cat if that's the one you missed.

 

I didn't miss anything. I pulled the factory harness out because the truck was on fire. Found a harness that worked BUT it did not have a plug for the 3rd o2 sensor. The harness is out of a 96. Took me 3 months to find a junkyard that had the correct truck. A 95 harness will not work nor will a 96 bronco.

 

And I Can't use a simulator because the harness does not have a plug for the 3rd sensor. I've had it in and out of the truck looking to make sure I didn't miss it

 

You can't use a simulator if you don't insert terminals where the o2 sensor wires, that would have come with an OBDII harness, attaching to the EEC (Electronic Engine Control) module. It seems you have a harness from a vehicle manufactured in 1995, not to be confused with the model year, 1996.

Now all you should need is a pinout of the EEC harness connectors, 4 terminals, and solder wires onto the terminals or crimp is my guess.

 

^^what he said, 95 and 96 are different electronically sadly. just to let you know, you dont NEED the o2 after the cat. but the CEL would get extremely annoying quick.

 

Am '96 Bronco will work, same thing.

 

Pin #95 should not have a wire in its place, as you said there is no 3rd O2 sensor connector in the engine harness, correct? If soldering or crimping a terminal for pin #95 is an option, you're in business. Otherwise, the entire harness has to be pulled, unfortunately.