matt06expy
Active Member
I have a 2006 expedition 4wd Eddie Bauer, last year I had a misfire happen on cylinder 2 so I ended up having to change the spark plugs since it was at 145k miles. Also changed coil, and injector on cylinder as well as the o rings on the rest of the injectors and it ran great afterwards. My question is after this was done, my check engine light came on and it reads pre cat bank 1, I've been told it's the passenger side cat needing to be changed, but also that it could be the o2 sensor? Any input is much appreciated. Thank you