1. Engine Repair
2. Engine Tune-up/Performance
3. Front End, Suspension & Steering Systems
4. Brakes & Braking Systems
5. Automatic Transmission
6. Manual Transmission,Front & Rear Drive Axles
7. Electrical Systems
8. Heating & Air Conditioning
9. Collision-related Mechanical Repair
10. Unitized Body Structural Repair
11. Pre-1973 Vehicles

The Heavy-duty Truck repair categories for vehicles over 10,000 pounds G.V.W. are:

1. Engine Repair - Gasoline
2. Engine Repair - Diesel
3. Drive Train
4. Brakes & Braking Systems
5. Suspension & Steering Systems
6. Electrical Systems
7. Collision-Related Mechanical Repair

Repair categories for other on-road vehicles are:

1. Motorcycle
2. Recreational Trailer

Individuals certified in all of the first 8 categories of Automobile and Light Truck repair is a Master Automobile mechanic.  Similarly, a mechanic certified in all of the first 6 categories of Heavy-Duty Truck repair is a Master Heavy-duty truck mechanic.  Individuals having certification in Motorcycle are also given a Master status. A mechanic certified in less than the first 8 automobile and light truck categories, or less than the first 6 heavy-duty truck repair categories or other category is considered a Specialty Mechanic.

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