× 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: Failed Smog Test
Posted to Technical Discussion Forum on 3/6/2020

Also check for a leaking EGR valve. Really anything that could cause even a slight misfire at idle will give you high HC and O2. Login to read more.