1997 lumina 3.1 oxygen sensor

[cfrank2]

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.

[maxwedge]

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

[cfrank2]

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

[maxwedge]

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

[Scrapper]

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...

[cfrank2]

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

[maxwedge]

Some are 7/8.

[Scrapper]

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.