If anyone has pictures and write-up for replacing the pre-cat O2 sensor on a 1997 4runner, I would greatly appreciate it!

thanks in advance.

 

I'm not sure exactly what problems you may be having and am not aware of any description besides the basics in this thread.

https://www.yotatech.com/forums/show...threadid=16010

You may want to post any specific concerns or questions if this doesn't help.

 

I replaced the pre-cat sensor on my '98. Didn't take pics or do a write-up, but you really don't need one.

It was very basic. Two nuts to un-do, and unplug the sensor's electrical connection. Install of new is the reverse procedure.

I didn't have any issues as described in the link in the previous post. I just used a 1/4 " socket, sorry but I forget the socket size.