× 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 July 2007

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 Corolla CE 1.8L MIL Lamp on VIN: 2T1BR32E63
P0420: Catalyst Efficiency Below Normal (Bank 1). hey techs, I Have this toyota po420 The sensors are looking good But I have A concern,In The archives I did not fine A whole bunch Of po420 problems I did see use oem parts or you might have problems.I went back Into Alldata and looked up a possible tsb And f...
July 09, 2007
2000 Nissan Maxima GLE 3.0L MIL Lamp on, CODE P0420 VIN: JN1CA31D2Y
P0420: Catalyst Efficiency Below Normal (Bank 1). ... of these problems. 1 month later both these codes popped. No drive ability issues at all. Just codes with mil light. Replaced knock sensor, figured maybe it was messing w/ timing and popping code p0420. Got rid of code p0325 when replaced knock sensor. I a...
July 23, 2007