EPA Faces Possible Suit Over Aftermarket Enforcement In Older Vehicles

A company that tunes diesel engines to bolster their efficiency is threatening to sue EPA, charging that a consent decree the company signed in 2023 exceeds Clean Air Act limits on the agency’s ability to regulate a vehicle’s “full useful life,” which is generally 10 years, not the broader definition officials adopted in 2020 guidance. Detroit-based Green Diesel Engineering (GDE) filed a Nov. 14 notice of intent (NOI) to sue that cites a May 31, 2023, settlement the company entered...