Control of Emissions From New Highway Vehicles and Engines: Approval of New Scheduled Maintenance for Selective Catalyst Reduction Technologies

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This notice announces that EPA has granted certain manufacturers new and limited variations in emission-related scheduled maintenance intervals for the replenishment of the nitrogen containing reducing agent for Selective Catalyst Reduction (SCR) technologies used in light-duty and chassis certified diesel vehicles for model years 2009-2010, and used in heavy-duty diesel vehicles and heavy-duty diesel engines for model years 2009-2011. SCR replenishment is considered critical emission-related maintenance.