× Auto Repair Pros Member Benefits TechHelp Knowledge Base Forums Resources My iATN Marketplace Chat Pricing About Us Join Industry Sponsors Video Members Only Repair Shops Auto Pro Careers Auto Pro Reviews
Join Now
International Automotive Technicians Network
Re: Cat Efficiency. a bad O2 sensor?
Posted to Technical Discussion Forum on 2/8/2009 2 Replies

I have seen a few Toyota truck post cat O2 sensors causing "false" P0420 codes. Usually I see these when there is already a brand new (OE) cat on the vehicle. Login to read more.

2 Replies Received (View Replies)