× 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: information
Posted to Technical Theory Forum on 1/3/2019

[...trimmed text...]

That's not what they are talking about. They are talking about when the ECM runs the test for the catalyst oxygen storage by forcing the exhaust stream rich and then lean. If the front O2 are not res... Login to read more.