DCS

I'm not near my truck, so I can't go look.

My GM truck has 2 upstream and 2 downstream O2 sensors, for a total of four.

How many are on the 4runner, and where are they located (upstream, downstream, etc)?

THX!

RunnerUp

i dont have a 2nd gen so i cant be sure, but im pretty sure i just read yesterday on here that you have one, upstream of your cat. and thats it

SacRunner

I only have 1 before the cat...91 4Runner 3.0L

I *THINK* only the OBDII ('96+) engines have 2 O2 sensors

LS1Steve

yup just 1 in front of cat

trythis

California trucks have 2, one in front, one in back

Elton

mine 91 only had 1

mt_goat

Yeah my 93 only had one. Just get under the truck and look, it's not like they are hard to see or something.

LS1Steve

wrong, depends on the year.

DCS

Thanks for the feedback guys. Mr goat, I have been under the truck this morning and confirmed only one.

I asked yesterday because i needed to know, and was 26 miles away from the truck.

Thanks for reading and replying.

DCS OUT!

trythis

Fair enough, my FSM only works for one year. I suppose if you go back far enough, there weren't any O2 sensors