Although the Haynes manual shows a pic of the single O2 sensor (4.3L engine shown) in the left exhaust manifold, I can't see it! I have the replacement part (got both a 3 wire and a 4 wire...since I don't know which is in my car).

I have been looking on the drivers side (that is the LEFT isn't it?)

Not much experience (as you can tell)!

Thanks in advance!

Should be a three wire. My 94 K5 takes a triple. Its right before the catalytic converter. Its on the passenger side.

Should be a three wire. My 94 K5 takes a triple. Its right before the catalytic converter. Its on the passenger side.
Thanks so much! If it ever stops raining here, I'll get a chance to look for it again.

If you have an s10 blazer (mid size vs full size) it's 4wire heated...

Oh ok. That i didn't know. Don't know why it would be that but ok. Same spot though.