CODE P0420

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

DCMACG69 in Blackwood NJ

Feb 5, 2010

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What are the best Ford repair shops?

RepairPal Certified shops can diagnose and repair your 2005 Ford Expedition. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.

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What is your question?

Popular Answer

CODE P0420

What is your question?

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

DCMACG69 in Blackwood NJ

Feb 5, 2010

2 Replies

Popular Answer

Oakmanon Feb 5, 2010

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.

kisses2kenney26on Jul 14, 2010

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

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Popular Answer

What are the best Ford repair shops?

RepairPal Certified shops can diagnose and repair your 2005 Ford Expedition. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.