Ok, I found one in the engine bay, one wire. Is there another one? and if so where? and if I buy the Bosch OEM replacements are they the same or what? some are listed as "upstream"? Am I going to need the special wrench for these?



Sorry guys just hoping someone could shed a bit of light so I can get these ordered and on the way for the weekend .... still chasing the "surge".
Thanks

 

My car only has one, right before the Cat Converter

 

That's great and the picture helps a lot. I ordered two Bosch and will give them a shot this weekend. Hopefully it fixes the "surge" issue

Thanks

 

I have a 6 cylinder car, I don't know if it's the same on every car

 

on the 305 you only have one and it's located on the collector of the driver's side header. I can't tell you where it is if you are running with restrictive exhaust but I didn't need an O2 extension so it must be on the y pipe but i yanked the stock exhaust when i bought the car and can't recall its exact location on stockers

 

It's in the drivers side manifold, at the bottom of the casting where the connection to the Y pipe is.

 

Thanks guys I will be waiting for them to get here ... If I start her up and she starts "surging" if I unplug the sensor would I be able to determine if the sensor is bad? Wouldn't it run like garbage?