ASE A1
Engine Repair (A1)
The ASE A1 Engine Repair test covers gasoline engine diagnosis and mechanical repair, from noise, leak and compression testing to cylinder head, valve train, block, lubrication and cooling work. It is taken by technicians who diagnose and rebuild engines, and it is one of the tests required for ASE Master Automobile Technician status.
- Questions you sit
- 55
- Scored
- 45
- Time allowed
- 75 min
- GearheadPass questions
- 159
From ASE's 2026 study guide. The test includes 10 unscored research questions you can't tell apart from the scored ones.
Content areas and weights
| Content area | Questions on the test | Share | Free practice |
|---|---|---|---|
| General Engine Diagnosis | 18 | 40% | 5 questions → |
| Cylinder Head & Valve Train | 6 | 13% | 5 questions → |
| Engine Block | 4 | 9% | 5 questions → |
| Lubrication & Cooling | 8 | 18% | 5 questions → |
| Fuel, Electrical, Ignition, Air Induction & Exhaust | 9 | 20% | 5 questions → |
Study each area
A1 · 18 questions on the test
General Engine Diagnosis
Pinpointing engine problems before teardown: verifying the concern, telling mechanical faults from other systems, and running vacuum, power balance, compression and leak-down tests.
A1 · 6 questions on the test
Cylinder Head & Valve Train
Inspecting and repairing cylinder heads and valve trains: valves, seats, springs, guides, lifters, cams, timing drives and variable valve timing and lift parts.
A1 · 4 questions on the test
Engine Block
Engine removal and block-level work: measuring cylinders, crankshaft, bearings and rods, timing camshafts and balance shafts, and reassembling with the right seals.
A1 · 8 questions on the test
Lubrication & Cooling
Diagnosing and servicing oil and coolant systems: oil pressure and leak tests, pumps and coolers, oil changes, cooling system pressure tests, thermostats, water pumps, fans and belts.
A1 · 9 questions on the test
Fuel, Electrical, Ignition, Air Induction & Exhaust
Finding engine problems caused by outside systems, then testing and repairing fuel, air induction, electrical, ignition and exhaust components.
Take a full-length A1 mock in the app
55 questions in 75 minutes, weighted like the real test, scored by content area, with English or Spanish on every question.
