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Congress Moves Swiftly on Diesel Emissions Sensor Relief

H.R. 9618, the Diesel Engine Flexibility Act, is advancing through Congress with unusual speed. The bipartisan bill addresses a persistent problem in trucking caused by faulty emissions sensors. Introduced July 9 by Reps. Brad Finstad, Jack Bergman and Michelle Fischbach, it cleared the House Energy and Commerce environment subcommittee by voice vote just five days later. The legislation targets problems stemming from 2010 heavy-duty NOx standards that mandate selective catalytic reduction systems on new diesel engines. When DEF sensors malfunction—a common occurrence unrelated to operator tampering—trucks face severe speed restrictions and costly downtime. Operators report $1,200 tow bills and three-week parts delays for $300 sensors, sidelining $180,000 vehicles. The issue affects trucking, agriculture and motorcoach operators alike. EPA guidance revisions announced in August 2025 laid groundwork for the legislative fix.