1999 Dodge Intrepid P0420

1999 DODGE INTREPID
147,000 MILES • 6 CYL • FWD • AUTOMATIC
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SKIPPER1551
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  • 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 10:19 PM
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BLUELIGHTNIN6
  • CAR REPAIR CONTRIBUTOR
  • 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 11:16 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.