1999 Dodge Intrepid P0420

SKIPPER1551

MEMBER
1999 DODGE INTREPID
6 CYL
FWD
AUTOMATIC
147,000 MILES

What causes the check enlight to come on and show error code P0420? What do you have to do to repair it?

Tuesday, December 1st, 2009 AT 10:19 PM

1 Reply

BLUELIGHTNIN6

MECHANIC
16,542 POSTS

DTC P0420 indicates Catalyst Sensor 1 / Bank 1 Efficiency Failure. Normally caused by faulty or failing oxygen sensor. Nothing serious at all, most it will do is cause your fuel mileage to drop slightly.

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1999 Dodge Intrepid P0420

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