1999 Dodge Intrepid P0420

1999 DODGE INTREPID
147,000 MILES • 6 CYL • FWD • AUTOMATIC
Avatar
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 10:19 PM
Advertisement
Avatar
BLUELIGHTNIN6
  • ✓ASE Certified Mechanic
  • 16,542 POSTS
  • ASE Certified Mechanic
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
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
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.