Control of Emissions From New and In-use Highway Vehicles and Engines: Approval of New Scheduled Maintenance for Exhaust Recirculation Valves in Certain Applications

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This notice announces that EPA has granted an engine manufacturer a new and limited variation in the emission-related scheduled maintenance interval for the exhaust gas recirculation (EGR) valve for some heavy duty engine families for model years 2007-2009. Diesel EGR valve cleaning is considered critical emission-related maintenance.