I went to 2 automotive stores today (auto-zone and NAPA). I asked for prices on O2 sensors for my car. I was told at Auto-zone that my car, A 1994 SSEi, has 2 O2 sensors. One before the cat and one after. I was shocked by this. I thought the bonnie had only one before the cat right behind the spark plugs. I went to NAPA and they confirmed what i thought. I had heard before here to go with AC Delco, However they only had Bosche. auto-zone was 50$ and NAPA 57$. If you guys wouldn't mind would you please confirm what is the best O2 sensor to use and where it is located? i believe this is how it is in my car. If i am wrong please let me know.
And i did try to look up O2 sensor in the search but i came up with Tons of posts and i gave up after the first few pages.
Thank you guys!