All 45 exams / A-series / ASE A9 Light Vehicle Diesel Engines
A9
ASE A9 Light Vehicle Diesel Engines
Light-duty diesel automobiles and light trucks
What's on the A9 exam?
1
General Diagnosis
2
Cylinder Head and Valve Train Diagnosis and Repair
3
Engine Block Diagnosis and Repair
4
Lubrication and Cooling Systems Diagnosis and Repair
5
Air Induction and Exhaust Systems Diagnosis and Repair
6
Fuel System Diagnosis and Repair
Content-area outline only, authored from ASE's public task-list structure. No test question, answer, or diagnostic scenario is reproduced from ASE or any prep publisher.
A9 quick reference A-series
Categoryrepair technician
Work experience2
Question count60
Time allowed75 minutes
Fee$62
Recert cycle5 years
Recert pathRetest (25-question, 30-minute recert version) every 5 years, or the ASE Renewal App.
Source: https://ase.com/wp-content/uploads/ASE_Automobile_Study_Guide.pdf.
Checked 2026-07-30.
Track this one
Already hold A9? Add it to your recert tracker.
Enter the date you earned A9 and the tracker flags exactly when it's due, and whether you're still inside the Renewal App credit window instead of a full retest.
Open the recert trackerCompare this test against the rest of the family in the full certification matrix, or use the which-test wizard to see if it fits your role.