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flag EPA removes DEF sensors from trucks to reduce failures and prevent sudden slowdowns.

flag The EPA has removed the requirement for Diesel Exhaust Fluid (DEF) sensors in heavy-duty trucks, replacing them with NOx sensors to fix frequent failures that caused sudden slowdowns. flag Starting in 2027, trucks will warn drivers for 650 miles after a fault before mild restrictions apply, reducing costly shutdowns and downtime for truckers and farmers.

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