Across the country, there are hundreds of thousands of auto professionals who are ASE Certified in dozens of specialty areas, including many professionals who are certified in multiple areas. The numbers of professionals currently certified by ASE are shown below (with information accurate through the Spring 2020 ASE test administration). This list is updated once a year in July.

Please note in addition, there are 57,181 students who hold current ASE Entry-Level certification.

Automobile Technicians173,213
Service Consultants15,398
Maintenance/Light Repair Technicians21,185
Advanced Engine Performance Specialists30,319
Collision Repair/Refinish Technicians12,033
Collision Damage Estimators4,281
Medium/Heavy Truck Technicians30,496
Truck Equipment Installation & Repair Technicians2,390
Compressed Natural Gas Technicians1,391
Transit Bus Technicians3,413
School Bus Technicians4,187
Parts Specialists19,377
Net Total Service Professionals231,186
Note: “Net Total” means individuals with multiple certifications are counted only once.
Master Automobile Technicians63,618
Master Collision Repair/Refinish Technicians2,950
Master Medium/Heavy Truck Technicians9,726
Master Medium/Heavy Vehicle Technicians1,101
Master Truck Equipment Technicians1,049
Master Transit Bus Technicians927
Master School Bus Technicians1,465
Automobile Series
A1: Engine Repair104,421
A2: Automatic Transmission Transaxle78,197
A3: Manual Drive Train and Axles85,566
A4: Suspension and Steering126,002
A5: Brakes134,521
A6: Electrical/Electronic Systems110,690
A7: Heating and Air Conditioning99,800
A8: Engine Performance98,103
A9: Light Vehicle Diesel Engines17,196
Maintenance/Light Repair Series
G1: Auto Maintenance and Light Repair21,185
Medium/Heavy Truck Series
T1: Gasoline Engines8,806
T2: Diesel Engines18,453
T3: Drive Train14,880
T4: Brakes20,574
T5: Suspension and Steering15,897
T6: Electrical/Electronic Systems16,979
T7: Heating, Ventilation & A/C15,391
T8: Preventive Maintenance Inspection17,963
Truck Equipment Installation and Repair Series
E1: Truck Equipment Installation and Repair Specialist1,692
E2: Electrical/Electronic Systems Installation and Repair1,629
E3: Auxilary Power Systems Installation and Repair1,540
Collision Repair and Refinish Series
B2: Painting and Refinishing6,827
B3: Non-Structural Analysis and Damage Repair5,766
B4: Structural Analysis and Damage Repair5,123
B5: Mechanical and Electrical Components7,069
Damage Analysis and Estimating
B6: Damage Analysis and Estimating4,281
Alternate Fuels Series
F1: Compressed Natural Gas Vehicle1,391
Advanced Level Series
L1: Automobile Advanced Engine Performance Specialist30,319
L2: Medium/Heavy Vehicle Electronic Diesel Engine Diagnosis Specialist3,771
L3: Light Duty Hybrid/Electric Vehicle Specialist1,540
Transit Bus Series
H1: Compressed Natural Gas (CNG) Engines699
H2: Diesel Engines1,636
H3: Drive Train1,579
H4: Brakes2,257
H5: Suspension & Steering1,791
H6: Electrical/Electronic Systems1,593
H7: Heating, Ventilation & A/C1,583
H8: Preventive Maintenance and Inspection1,857
School Bus Series
S1: Body Systems and Special Equipment2,443
S2: Diesel Engines2,156
S3: Drive Train2,152
S4: Brakes3,202
S5: Suspension and Steering2,258
S6: Electrical/Electronic Systems2,180
S7: Air Conditioning System and Controls1,215
Service Consultant Series
C1: Automobile Service Consultant15,398
Specialty Tests
X1: Exhaust Systems5,375
Parts Specialist Series
P1: Medium/Heavy Truck Parts Specialist1,347
P2: Automobile Parts Specialist17,942
P4: General Motors Parts Consultant1,068