Credential type: certification examination · verified on the issuer's site September 19, 2026 issuer page

Exam Domains

A General Diagnosis 24%

B Ignition System Diagnosis and Repair 16%

C Fuel, Air Induction and Exhaust Systems Diagnosis and Repair 18%

D Emissions Control Systems Diagnosis and Repair 16%

D.1Positive Crankcase Ventilation (1)
D.2Exhaust Gas Recirculation (2)
D.3Secondary Air Injection (AIR) and Catalytic Converter (2)
D.4Evaporative Emissions Controls (3)

E Computerized Engine Controls Diagnosis and Repair 26%

Exam Details

Question TypesMultiple Choice, Composite Vehicle Scenario (L-series)

FormatLinear (computer-based)

Online ProctoringAvailable

ID RequirementsOne government-issued photo ID with full name. Name must match ASE registration exactly.

RenewalRequired -- ASE certifications are valid for 5 years. Recertification is achieved by retaking and passing the current version of the test before the expiration date. No continuing education requirement — recertification is exam-only.

Prerequisites2 years of hands-on working experience as an automotive technician

Retake Policy30-day waiting period between attempts. Full test fee required for retake. ASE registration fee applies per testing window.

LanguagesEnglish

A8 Engine Performance (A8) Exam Blueprint

Exam Domains

Exam Details

Official Study Resources