1997 lumina 3.1 oxygen sensor

Hello, i decided to replace both my oxygen sensors since im doing a tune-up and my car is arround 100,000 and i was wondering where the upstream sensor is located and how much working room i would have? do i have to pull anything out of the way? do i have to use a oxygen sensor socket or could i use an open end wrench to get it off?

Thanks for any help.

Just off the rear manifold, about 6 inches down he pipe, use an O2 socket or 13/16 box wrench.

Thanks for the info, is the sensor after the cat. converter the same size?

Correct, remember that one has no affect on mileage or performance.

hey they got the socket with a split in it so you dont tear the whire up about 10.00 bucks i really cant remember but i bought one i new i was going to use it again so you might just want to buy it wont break your wires as i said and i bought mine at auto zone...

I just recieved my oxygen sensors today and i tried the 13/16 wrench and it was the wrong size, i was either going to use that or buy a sensor socket. What is the correct size wrench or are all the sensors the same size? i need to know if i go to buy a sensor socket.

Thanks

Some are 7/8.

take it to parts store it's littler isn't it? i think takes like a 5/8 or smaller.but if you haven't got it yet tell them to pull 02 up and go by that.