ASE certifications list, series by series

The ASE test series

The series as listed in the Certification: Need to Know guide (revised January 2026):

• Automobile and Light Truck, A1–A9: engine repair, transmissions, drive train, suspension, brakes (A5), electrical (A6), heating and A/C, engine performance (A8) and light-vehicle diesel; A1 Engine Repair is the first. A1–A8 lead to Master Automobile Technician.
• Maintenance and Light Repair, G1: one test across the routine service work of a shop, with a shorter experience requirement.
• Medium-Heavy Truck, T1–T8: eight truck tests, T2–T8 for Master truck status. See also diesel certification.
• Advanced Level, L1–L4: L1 engine performance, L2 electronic diesel, L3 light-duty hybrid/electric, L4 ADAS. Each needs a prerequisite test first.
• Collision, B2–B6 · Service Consultant, C1 · Alternate Fuels, F1 · Transit Bus, H1–H8 · Parts Specialist, P1–P2 · School Bus, S1–S7 · Military, MIL1–MIL8.

Entry-level (student) certification is a separate program for students, with its own tests and score rules.

The tests on this site

ASE certification requirements

Two things make a certification: a passed test and approved work experience.

• Work experience: 2 years of full-time hands-on work (or the part-time equivalent) for A and T tests, 1 year for G1, 3 years for Advanced Level tests.
• Training credit, A and T tests: An ASE-accredited program counts as 1 year, an OEM co-op program up to 2 years, 3+ ASE entry-level tests as 1 year, other training up to 1 year; substitutes cannot be combined.
• Training credit, G1: An ASE-accredited program counts as 6 months, an OEM co-op program as 1 year, 3+ ASE entry-level tests as 6 months; substitutes cannot be combined.
• Order doesn't matter: you can test first; the certificate waits until the experience is approved. You can pass a test as a student or a new hire and collect the certificate later.
• Prerequisites apply only to the Advanced Level. L1: you must have passed A8 Engine Performance first. L2: you must have passed one diesel engine test (A9, H2, S2 or T2) and one electrical test (A6, H6, S6 or T6) first.

There is no school or degree requirement. ASE's Need to Know guide calls the certification voluntary.

How to get ASE certified

1. 1

   Open a myASE account

   Tests are bought and scheduled at my.ase.com. Pick the test where your work is strongest: G1, the broadest one, or the A test closest to your daily jobs.

2. 2

   Buy the test in a registration window

   Tests are sold in quarterly registration windows. Current window: Oct 10–Dec 31 (fall 2026). From purchase you have 90 days to sit the test.

3. 3

   Book a Prometric appointment

   First attempts are at a Prometric test center, with one exception: G1 is the only ASE test you can take remotely the first time; register at least 4 days ahead.

4. 4

   Take the test

   Computer-based multiple choice with a pop-up English–Spanish glossary; the A tests and G1 also have a side-by-side Spanish version.

5. 5

   Get results, then the certificate

   Score report emailed when you finish the test. The certificate follows once your work experience is approved, about three weeks after the test per the FAQ on ase.com.

How long it takes

The test itself is one sitting: 90 min for G1, 75 min for A1, 90 min for A6. The calendar is set by the work experience: 1 year for G1, 2 years for an A or T test, less with approved training. Someone who already has the experience can buy, sit and pass a test within the 90 days that a purchase allows.

Test centers and remote testing

The tests run on Prometric's network. Testing is offered in the United States, U.S. territories and Canada, and on some overseas military bases. A first attempt is test center only for every test except G1, which you can take with live remote proctoring at home or work. Recertification tests can be taken remotely for every series. You choose the center when you book the appointment in myASE.

Passing score

Not published by ASE. ASE releases neither a cut score nor the questions you missed. You get pass or fail and a detailed score report. The “70%” or “50–60%” figures that circulate online come from the entry-level student tests, a different program.

Recertification

Every certification lasts 5 years, then a recertification test; a recertification resets the expiry to five years from the recert date. Recertification tests for the A, G1 and T tests are about half the length of the original (A1's is 23 questions, 30 minutes); Advanced Level recertification tests are full length (L1's is 50 questions, 2¼ hours). A-series holders can extend through the Renewal App instead. Details and costs: recertification and test cost.

Practice on your phone

Optional. The guide stays on this page; each test also has a free practice test here.

Next steps

• ASE study guide →Free official study guides, 2026 changes, licensed books, task-list plan
• Master Technician →The eight tests A1–A8, Master truck T2–T8, and how to keep the status
• ASE test cost →Registration, test, retake and recertification fees for each test, as of Oct 2026
• Diesel certification →Which diesel test to take: T2 for trucks, A9 for light vehicles, L2 above them
• ASE recertification →Recertification tests, remote testing and the Renewal App: when, how and what each costs
• How to become a mechanic →School or on-the-job, then the ASE tests: the path from first job to certified technician
• Mechanic certification →ASE certification, school certificates, OEM programs and state licenses: what each one is