× 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: Hino Catalyst code
Posted to HD/Fleet Forum on 4/1/2021 11 Replies

Hi William,

P0420 on a diesel generally means the DOC isn't lighting off during regen. If it has a hydrocarbon injector that would be the first thing I would check. Otherwise run a regen and monitor your DOC inlet, outlet and DPF inlet and outlet temps durin... Login to read more.

11 Replies Received (View Replies)