How many O2 sensors does my 94 have? Which should I change? All? Thanks

 

you have two yes if your going to change one change them both dont really have to but if your going to do it do it once

 

why would you need to change them?
not sure on a 94 but my 97 is dual cat, and i have 2 before and 2 after my cats. i have lts now though

ur is single cat so IF it has them after the cat, u should have 1 on each manifold and 1 after the cat,,

IF you don't have one after the cat, u should just have 1 on each manifold.

not sure, just kinda guessing

 

his car is a 94 wich is an obd1 car there is no o2 sensors after the cat there is one in each manifold none after the cat yours is a 97 obd2 you have o2s after the cats they do go bad after a while

 

Thanks for the info Mike. I'm glad its only 2 of them.

 

Just a follow up on this....does anyone have the part number for OEM replacement sensors? The number I have is 25312184 and I just want to make sure its correct.

Thanks

 

as stated. he has 2 02's due to having OBDI. 96and up OBDII have 2 pre and 2 post cat 02's the difference being for emitions control with the post cat 02's to test the efficency of the cats.

02's can fail from age, biuldup, anti freez/ silicone contamination ect ect

they can also be slow or lazy casing slow responce and bad fuel trim control. it's not a bad idea to think of 02's as a tune up part

 

yeh he has 2 i got a 94 and i do, Id take Mike383LT1 advice and change them both why your down there to.