Thread: How Many o2 Sensors?

Originally Posted by Fivefingerdeathpunch

You only have 2 sensors. One before and one after the cat.

You'd only have 4 sensors if these cars had two cat converters.

Likely the converter is going away on you and thus the codes you see.

Thanks! I remember when I purchased the car, the kid had told me that he had changed the CAT with an aftermarket one. I was hoping it wasn't that but now that I have two brand new AC Delco sensors in place and still dropping this code, I bet I will have to change it out myself with a new unit.