Anyone know this?

I've replaced my pre-cats twice with O2's from eBay (probably my problem there) and keep having the CEL on for pre-cat O2's.
I want to do a search with some online vendors with the OEM part number...maybe I can find it less than 120 bones a pop.

 

Dealer should supply you with part # once you ask him (VIN).

How long does it take to change the sensors?

 

Not long, about 1-2 hours depending on if the OEM ones are hard to get out.