ASE A9 Practice Test 2026: Light Vehicle Diesel Engines
Test yourself with real exam conditions.
A full, timed practice test for each ASE automobile test, drawn at random from its own questions and sized and timed like the real one.
The rules
- Questions
- 50Four answers, one right, one point each
- Pass mark
- 35 of 50 pointsAt most 15 wrong or unanswered
- Time limit
- 75 minOne clock for the whole exam; it is handed in when time runs out
- Going back
- Go back any timeMove between questions and change answers until you hand in
All 3,937 questions in the app
How the A9 practice test works
This is the ASE A9 Light Vehicle Diesel Engines test in your browser: 50 questions drawn at random from 410 A9 practice questions, with 75 minutes for all of them, the scored length and time of the real test. Each question has four answers and one is right, and you can move between questions and change your answers until time runs out.
When time runs out, the test is submitted as it stands. You see your score and every question you missed, with its explanation. ASE publishes no fixed passing score, so this practice test counts 35 right answers out of 50 as a pass: you can miss 15.
What the A9 test covers
ASE's test specifications split the 50 scored questions into these content areas:
- General Diagnosis9
- Cylinder Head and Valve Train Diagnosis and Repair5
- Engine Block Diagnosis and Repair5
- Lubrication and Cooling Systems Diagnosis and Repair6
- Air Induction and Exhaust Systems Diagnosis and Repair12
- Fuel System Diagnosis and Repair13
The real A9 test
The real test has 50 scored questions and 10 research questions that don't count toward your score, mixed in unmarked, all in 75 minutes, so answer every one. You take it at a Prometric test center, or online at home or work if you're eligible, and you can show each question in Spanish beside the English. A9 is not one of the eight tests, A1 to A8, that make an ASE-Certified Master Automobile Technician.
Read before the exam
- Free ASE practice tests: all nine, A1 to A9
- ASE A1 practice test: Engine Repair
- ASE A2 practice test: Automatic Transmission/Transaxle
- ASE A3 practice test: Manual Drive Train and Axles
- ASE A4 practice test: Suspension and Steering
- ASE A5 practice test: Brakes
- ASE A6 practice test: Electrical/Electronic Systems
- ASE A7 practice test: Heating and Air Conditioning
- ASE A8 practice test: Engine Performance
- All guides
Questions about the exam
How many questions are on the ASE A9 test?
50 scored questions in 75 minutes, plus 10 research questions that don't count and aren't marked. This practice test has the 50 scored ones, in the same time.
What does the A9 test cover?
The fuel system and air induction and exhaust take the most questions, then general diagnosis, lubrication and cooling, the cylinder head and valve train, and the engine block.
What score do I need to pass A9?
ASE doesn't publish a fixed passing score. This practice test counts 35 of 50 (70%) as a pass, a fair target to beat before you book the real test.
Is the A9 practice test free?
Yes, free and with no sign-up. The iPhone app has all 410 A9 questions by topic, with every answer explained and your mistakes brought back for review.