Farmers could disable diesel exhaust fluid systems under House-passed bill

By: Cami Koons

Outlets: Iowa Capital Dispatch

Published: March 3, 2026

Words: 708

Last Updated: 1 week, 1 day ago

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The Iowa House advanced a bill Monday that would allow farmers to disable the diesel exhaust fluid, or DEF, systems required by federal emissions laws.

House File 2529 would require manufacturers of farm equipment with DEF systems to provide diagnostic and repair information as well as software regarding the repair of a DEF system, so that farmers don’t have to rely on authorized technicians to fix a stalled machine.

Rep. Derek Wulf, …

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