Hey guys, here's the previous post from awhile back before I moved.
https://www.yotatech.com/forums/f116...hlight=code+21
Now I am all settled in and ready to dive back into this truck.

I guess the easy question for now:

Does the 1987 Toyota 4runner 22RE 4x4 EFI come factory with a 1-wire or 4-wire O2 sensor?

 

My 86 has a 1 wire and it's mounted on the exhaust manifold.

 

My 87 has a 1 wire, also was installed in the manifold. I had to cut and extend the wire when I installed my LCE header.


Should be easy to judge by looking at it.