How Many O2 Sensors

[rjschmitty]

I have a 94 Runner, 6 cyl, 5 speed. How many O2 sensors should there be? I found one pre-cat but can't seem to find any other. Thanks for the help.

 

[fourwd1]

Federal only has 1 O2 sensor, Cali has 1 before and 1 after the cat conv.

 

[packers15]

I have a 92 that I bought from the original owner in California, and it was purchased originally from a Toyota dealer in California and it has only one O2 sensor and it is in front of the cat.

 

[rjschmitty]

Thanks for the help. I know I'm not going crazy finding only one.

 

[Dreiner]

O2 Sensor

???Hmm, I'm fairly certain 4Runner's have two O2 sensors. One in front of the converter and one behind it.

I could be wrong, but I don't think so.

 

[4runner_kid]

I have only 1 and it's California truck.

 

[T-Dubya]

My california 93 only has one also. i checked into it and its correct, I believe its a pre OBD2 thing.