» » »

Ford Q&A

Ask Your Question

2005 Ford Expedition Question: CODE P0420

 

Question

DCMACG69, Blackwood, NJ, February 04, 2010, 16:31
 Rookie

HAVE CODE PO420 WITH CHECK ENGINE LIGHT REPLACED RIGHT BANK CAT AND HEATED OXYGEN SENSOR BEFORE CAT. WHAT ELSE COULD BE WRONG?

2 Answers
Flag This
  • Answer #1

    February 04, 2010, 16:41
     Master

    Did you change the O2 sensor before or after the Cat on your 2005 Ford Expedition? I know of one case (It was a Cadillac) where the rear O2 sensor, the one after the Cat failed in such a way to case a P0420 to set.

    Reply
    Flag This
  • Answer #2

    July 14, 2010, 11:32
     Rookie

    We have same model, same problem. Ever figure it out?

    Reply
    Flag This