Trouble code P0420

146,723 MILES • 3.5L • 6 CYL • 4WD • AUTOMATIC
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KMCCONKEY92
  • MEMBER
  • 1 POST
Trouble code P0420-Catalyst System: Efficiency Below Threshold (Bank 1).
Jan 1, 2020 at 3:53 AM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
Good evening,

You need the cat converter for bank1. The precious metals are worn out and it needs to be replaced.

If you have less than 80,000 on your car then it is a warranty item.

Roy
Jan 1, 2020 at 8:29 AM
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