× 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

P0420 Diagnostic Trouble Code Discussion for May 2015

Catalyst Efficiency Below Normal (Bank 1)

Note: This is a professional automotive technician's resource.
Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.

Trouble Ticket Help Requests for DTC P0420
Help Request Posted
2003 Toyota Camry SE 2.4L Poor Idle Quality, Cuts out, Stall VIN: 4T1BE32K63
P0420: Catalyst Efficiency Below Normal (Bank 1). ... changed the alternator on this car,after that car start to cuts off and would not idle. If we keep foot on the gas very slightly she keep running ! but as soon as let the gas go she will quit running. We pressure test the exhaust due to code p0420 ,it was ...
May 05, 2015
2004 Chevrolet Aveo 1.6L Misfire VIN: KL1TD62644
P0420: Catalyst System Low Efficiency. Owner brought because mil is on, flashing while driving, shop that done work has give up. On compression test got 135 all but number 3 with 125. With data stream can see timing at 4 with no advance. Also can hear timing belt whine. Pull covers and it looks as ...
May 21, 2015