1999 Dodge Intrepid P0420

1999 DODGE INTREPID
147,000 MILES • 6 CYL • FWD • AUTOMATIC
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SKIPPER1551
  • MEMBER
  • 1 POST
What causes the check enlight to come on and show error code P0420? What do you have to do to repair it?
Dec 1, 2009 at 2:19 PM
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BLUELIGHTNIN6
  • ✓Experienced 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.
Dec 1, 2009 at 3:16 PM
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