Engine Mechanical problem
2002 Ford Escape 6 cyl Two Wheel Drive Automatic 132K miles
I get a check engine light for a code 420 Catalyst system efficiency below threshold Bank 1.
I was told that bank 1 will include the manifold with cylinder 1. I have replaced the exhaust manifold on the front side which has a "flash off converter" built in and both sensors on that manifold.
I can reset the code and drive sometimes 300 miles over several days and then the code comes back.
It seems to always come back when I first start the engine when it does come back.
How can I eliminate this check engine light code?
have the same problem?
Wednesday, November 12th, 2008 AT 5:20 PM