All 45 exams / L-series / ASE L2 Electronic Diesel Engine Diagnosis Specialist
L2
ASE L2 Electronic Diesel Engine Diagnosis Specialist
Diesel-engine automobiles and light trucks, advanced diagnostics
What's on the L2 exam?
1
General diesel engine diagnosis
2
Electronic diesel engine controls
3
Diesel engine air induction and exhaust systems
4
Diesel fuel systems
5
Specialized fuel systems (high pressure common rail, electronic unit injector, hydraulic electronic unit injector)
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.
L2 quick reference L-series
Categoryrepair technician
Prerequisite A9 or H2 or S2 or T2, A6 or H6 or S6 or T6 must be held first
Work experience3
Question count55
Time allowed120 minutes
Fee$124
Recert cycle5 years
Recert pathRetest every 5 years (same 120-minute format); ASE Renewal App availability for L2 was not confirmed on this pass.
Source: https://ase.com/tests/l2/.
Checked 2026-07-30.
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