Erich Zeppelin
Full Access Members
1999 Ford Expedition, 5.4L
Well, started out with a code that said my downstream o2 sensor was shot, so I replaced both rear sensors, reset the EMS and everything was right with the universe..........until the $&@¥%#! SES came back on. Pulled a P0420, no other codes. That particular code is for the passenger side cat. Seems like it would have thrown a few other codes in addition to the P0420. I can't see the cat just going out like that............
Well, started out with a code that said my downstream o2 sensor was shot, so I replaced both rear sensors, reset the EMS and everything was right with the universe..........until the $&@¥%#! SES came back on. Pulled a P0420, no other codes. That particular code is for the passenger side cat. Seems like it would have thrown a few other codes in addition to the P0420. I can't see the cat just going out like that............
