The National Institute for Automotive Service Excellence (ASE) was founded in 1972 as an independent, non-profit organization.
Mission: To improve the quality of automotive service and repair through the voluntary testing and certification of automotive professionals.
The ASE program offers more than forty exams across specialty areas such as:
Automobile/Light Truck
Collision Repair
Medium/Heavy Truck
Truck Equipment
School & Transit Bus
Auto and Truck Parts
ASE also features the online EPA Section 609 Refrigerant Recovery and Recycling program.
Test questions focus on real-world diagnostic and repair problems, not theory. Upon passing at least one exam and accruing the relevant work experience, you earn ASE certification. To remain certified, you must successfully retest every five years.
ASE's L1 test consists of 50 questions surrounding the analysis and diagnostics of general power-train, computerized power-train controls including OBD-II systems, ignition control systems, fuel and air induction systems, emission control systems, and emission Inspection and Maintenance (I&M) failures. Certification expires after 5 years and unlike most other ASE tests, the re-certification test is the same length as the original certificatio...
ASE's L2 Electronic Diesel Engine Diagnosis Specialist Certification test consists of 45 questions surrounding the analysis and diagnostics of general diesel engine system controls consisting of electronic, air induction and exhaust systems, fuel systems, specific fuel systems including EUI, PLN-E and HEUI. Certification expires after 5 years and unlike most other ASE tests, the re-certification test is the same length as the original certificati...