The Tier 4 Final Emissions Systems Diagnostics course is intended for Cat Dealer service training instructors, technical communicators, and service technicians. This course focuses on Cat solutions to meet EPA Tier 4 Final and EU Stage 4 nonroad diesel engine emissions regulations. This course provides advanced systems operation information with an emphasis on hands-on diagnostic and repair techniques. Topics include the air systems, aftertreatment, fuel systems, selective catalytic reduction, and the operator interface.