Two companies fined for diesel emission tampering

Two companies from Iowa and Nebraska have been fined for tampering with emission controls for hundreds of customers. 

Environmental protection agency says the companies - Midwest Truck Products of Cantril, Iowa; and South Central Diesel Inc. of Holdrege, Nebraska - installed or sold "defeat devices" that make emission controls inoperative. 

Midwest Truck Products will pay a $75,000 penalty and South Central Diesel Inc. will pay a $50,000 fine. 

The EPA says the companies tampered with vehicles or sold the "defeat devices" to hundreds of customers.