Free ASE T2 Exam Prep
ASE T2 — Diesel Engines (Medium/Heavy Truck) Certification
Prepare for the ASE T2 exam without spending hundreds on expensive prep courses. Free study guides, practice questions, flashcards, and related exam resources.
Quick Facts
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ASE ASE Certifications License: Complete Roadmap
Follow this path to organize your licensing and exam preparation
Master Fuel System DiagnosisYou are here
Start with the largest area: common-rail, HEUI, and unit injectors, transfer/high-pressure pumps, rail pressure control, injector testing, and calibration codes.
Build General Engine Diagnosis Skills
Practice low-power, hard-start, no-start, smoke, and contamination diagnosis using compression, cylinder-cutout, blowby, and oil-analysis methods.
Add Air, Exhaust, Cooling, and Lubrication
Review turbo/VGT, charge air cooler, EGR, DOC/DPF/SCR, oil pressure, coolant chemistry, and wet-liner cavitation.
Finish Mechanical, Electrical, and Brakes
Cover cylinder head/valve train, engine block, starting/charging voltage-drop testing, and compression/exhaust engine brakes under timed sets.
Can You Take the ASE T2 Exam?
Check if you meet the basic eligibility requirements
- •Pass the T2 test to earn the certification (work experience is verified for certification)
- •Tests are delivered by appointment at Prometric test centers
- •Certifications are valid for five years and require recertification
- •Relevant formal training can substitute for up to one year of the experience requirement
ASE T2 Quick Facts
Time to Get Licensed
4-8 weeks typical preparation
From start to license in hand
Retake Policy
Retake timing follows current ASE policy; confirm the live ASE registration rules before scheduling another attempt.
Total Cost Breakdown
Free ASE T2 Prep Tools
Reported exam pass rate: Not publicly reported by ASE. These figures describe exam candidates, not OpenExamPrep user outcomes. Check the exam sponsor’s website for published statistics.
100 Practice Questions
Covers all eight official ASE T2 content areas with detailed answer rationales.
Current 2026 Content Areas
Built to the official ASE T2 distribution: 55 scored items (65 total) in 90 minutes.
Free Prep
Use the full diesel-engine bank with no paywall while targeting weak content areas.
What You'll Study
11 chapters covering the exam topics in this guide
Chapter 1: General Engine Diagnosis: Symptoms & Verification
4 sections
Chapter 2: General Engine Diagnosis: Mechanical & Fluid Testing
3 sections
Chapter 3: Cylinder Head & Valve Train Diagnosis & Repair
5 sections
Chapter 4: Engine Block Diagnosis & Repair
5 sections
Chapter 5: Lubrication Systems Diagnosis & Repair
3 sections
Chapter 6: Cooling Systems Diagnosis & Repair
4 sections
Chapter 7: Air Induction & Exhaust Systems
4 sections
Chapter 8: Fuel Delivery & Common Rail Fuel Systems
3 sections
Chapter 9: EUI, HEUI & Fuel Quality Diagnosis
4 sections
Chapter 10: Starting & Charging Systems
3 sections
Chapter 11: Engine Brakes (Compression Release & Exhaust)
3 sections
ASE T2-Specific Topics Covered
ASE T2 Exam Details
ASE T2 — Diesel Engines (Medium/Heavy Truck) Certification
Administered by ASE (National Institute for Automotive Service Excellence)
Exam Content Breakdown
Based on the official ASE (National Institute for Automotive Service Excellence) content outline
Low-power, hard-start, no-start, excessive-smoke, knock, and oil/coolant contamination diagnosis using compression, cylinder-cutout, blowby, and oil-analysis methods.
Cylinder head warpage and cracks, valve guides and seats, valve lash adjustment, rocker arms, and head resurfacing/gasket selection.
Block deck flatness, cylinder bore and liner wear, liner protrusion, crankshaft end play, bearing clearances, and reciprocating-assembly inspection.
Oil pressure, oil cooler and oil analysis, thermostats, water pump, fan clutch, coolant chemistry, and wet-liner cavitation.
Intake restriction, turbocharger and VGT, charge air cooler, EGR, and aftertreatment (DOC, DPF regeneration, SCR/DEF) diagnosis.
Common-rail, HEUI, and unit-injector systems, transfer/high-pressure pumps, rail pressure control, injector testing and calibration codes, and fuel contamination.
Battery, starter and cranking circuit, voltage-drop testing, alternator output, and AC ripple/diode diagnosis on heavy-duty trucks.
Compression-release and exhaust engine brake operation, enable conditions, hydraulic actuation, and slave-piston lash adjustment.
What's Included
11 Chapters
Complete exam coverage
Practice Quizzes
With detailed explanations
Free to Start
No credit card required
Quality Exam Prep Shouldn't Cost Hundreds
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ASE T2 Exam FAQ
Official ASE (National Institute for Automotive Service Excellence) Resources
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