Fact sheet from the Environmental Protection Agency (EPA) discussing Diesel Exhaust Fluid (DEF) Sensor Guidance. It mentions EPA Administrator Lee Zeldin's initiatives, guidance removal of DEF sensor requirements, and potential savings of $13 billion annually. Discusses actions taken by the Trump administration and issues with DEF inducements and sensor malfunctions. Includes selective catalytic reduction systems and implications for manufacturers, farmers, and vehicle operators. Document dated March 2026, labeled EPA 420-F-26-006.

United States Environmental Protection Agency (EPA) document detailing guidance from March 2026 on ensuring reliable DEF systems. The guidance includes adopting reliable monitoring technologies, aligning with the Right to Repair clarification, and addressing concerns of farmers, truckers, and other equipment operators. It emphasizes retaining emissions standards while increasing operational reliability and economic benefits, citing potential savings for various vehicle operators.