Question about 2005 Chrysler Pacifica
How do I fix a 420 code
420 is a catalytic converter afficiency code. It could cause by many problems: bed fuel, old spark plugs, sensor wiring connection. I would replace plugs and fill with premium fuel, turn off the code and drive to see if it comes back. If it does, stop by any muffler shop and have them run cleaner threw your system, it may give you 5 to 6 month driving but sooner or later you will need new cat for your car. Hope it helps.
Posted on Apr 30, 2014
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