Free ASE T1 Exam Prep
ASE T1 — Gasoline Engines (Medium/Heavy Truck) Certification
Prepare for the ASE T1 exam without spending hundreds on expensive prep courses. Free study guides, practice questions, flashcards, and related exam resources.
Quick Facts
1 Job Wiki
Free CE
Buy on AmazonExplore More ASE Certifications
Continue into nearby exams from the same family. Each card keeps practice questions, study guides, flashcards, videos, and articles in one place.
More From This Family
Videos and articles for deeper review.
ASE ASE Certifications: Study Roadmap
Follow this path to organize your exam preparation
Master General Engine DiagnosisYou are here
Focus on the largest area (28%): complaint verification, compression, leak-down, running compression, vacuum testing, smoke and noise diagnosis, and starting/charging electrical tests.
Build Computerized Controls and Emissions
Practice OBD-II monitors and drive cycles, sensor and 5V reference testing, fuel trims, DTC strategy, PCV, EGR, AIR, EVAP, and catalyst efficiency diagnosis (26% combined).
Add Ignition, Fuel, Air, and Exhaust
Drill primary/secondary ignition, scope waveforms, CKP/CMP sensors, fuel pressure and volume testing, electronic throttle control (TAC), vacuum leaks, exhaust backpressure, and LPG systems (24% combined).
Finish Head, Valvetrain, Block, Lube and Cooling
Review cylinder head warpage and valve service, bore and bearing metrology, Plastigauge, camshaft/timing drive, oil pump clearance, cooling pressure tests, and fan clutches (22% combined).
Can You Take the ASE T1 Exam?
Check if you meet the basic eligibility requirements
- •ASE evaluates the two-year Repair Technician requirement and approved training credits; accredited OEM-sponsored co-op completion can receive two years, while other listed training alternatives generally receive one year or less.
- •Each ASE T-series test, including T1, is registered for and taken individually
- •T1 is not required to earn the Master Medium/Heavy Truck Technician credential (which requires T2 through T8)
- •Certifications are valid for five years; the T1R recertification test has 25 scored questions in 30 minutes
ASE T1 Quick Facts
Time to Get Licensed
4-8 weeks as a planning estimate; actual time depends on experience and weak areas
From start to license in hand
Retake Policy
After either a Pass or Fail result, wait 30 full days before purchasing and scheduling the same ASE test. Purchased tests must be scheduled and taken within 90 days.
Total Cost Breakdown
Free ASE T1 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 T1 content areas with detailed answer rationales.
Current 2026 Blueprint
Built to the 50-scored / 60-total, 75-minute ASE T1 structure with the official 28/8/8/6/12/12/10/16 weighting.
Free Prep
Use the full bank with no paywall while targeting weak diagnostic areas before the Prometric test.
What You'll Study
11 chapters covering the exam topics in this guide
Introduction & ASE T1 Exam Overview
2 sections
Chapter 1: General Engine Diagnosis — Complaints, Leaks, Noises & Exhaust
6 sections
Chapter 2: General Engine Diagnosis — Vacuum, Balance, Compression & Leak-Down Testing
5 sections
Chapter 3: General Engine Diagnosis — Electrical, Starting, Charging & Lab Tools
4 sections
Chapter 4: Cylinder Head & Valve Train Diagnosis and Repair
6 sections
Chapter 5: Engine Block Diagnosis and Repair
8 sections
Chapter 6: Lubrication & Cooling Systems Diagnosis and Repair
6 sections
Chapter 7: Ignition System Diagnosis and Repair
6 sections
Chapter 8: Fuel, Air Induction & Exhaust Systems Diagnosis and Repair
9 sections
Chapter 9: Emissions Control Systems Diagnosis and Repair
6 sections
Chapter 10: Computerized Engine Controls Diagnosis and Repair
9 sections
ASE T1 Exam Details
ASE T1 — Gasoline 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
Customer concern verification, compression, cylinder leakage, running compression, vacuum testing, exhaust smoke and noise diagnosis, oil consumption, no-start, and starting/charging electrical diagnosis on medium/heavy-duty truck gasoline engines.
Burned and leaking valves, valve guide and seal wear, head warpage and surface finish, hydraulic lifters, rocker arms, pushrods, valve springs, and overhead camshaft service.
Cylinder bore measurement and honing, in-block camshaft and timing drive service, bearing wear and clearance with Plastigauge, crankshaft endplay, select-fit bearings, piston ring end gap, vibration damper, and flywheel/flexplate runout.
Oil pressure testing, oil pump clearance and relief valves, oil cooler testing, thermostat operation, cooling-system pressure testing, coolant service, water pump, radiator, fan clutch operation, and warning indicators.
Primary and secondary ignition circuit diagnosis, coil testing, spark plug reading and wear, secondary ignition scope analysis, misfire and ignition DTC diagnosis, CKP/CMP sensors, spark knock, and ICM/PCM control.
Fuel pressure and volume testing, fuel pump control circuits, fuel trim and DTC analysis, vacuum leaks, air filtration restriction, exhaust backpressure, injector balance, gasoline direct-injection service, and electronic throttle control (TAC).
PCV, EGR, secondary air injection (AIR), catalytic converter efficiency, EVAP leak and purge/vent control diagnosis, scan data interpretation, and five-gas exhaust analysis.
OBD-II monitors, enable criteria, freeze frame, and drive cycles; sensor, actuator, and 5V reference testing with scan tool, DMM, and DSO; diagnosis with and without DTCs; PCM power/grounds, J2534 reprogramming, and interrelated systems.
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
I'm Ran Chen, an engineer with 20+ years of coding experience. I passed my Life Insurance license, EA exam, SIE, Series 6, 63, 65, and finally the CFP® exam.
Through all these exams, one thing became clear: exam prep is expensive. But with AI, we can change that. Quality preparation can now be free for everyone.
ASE T1 Exam FAQ
Official ASE (National Institute for Automotive Service Excellence) Resources
Verify information with these official sources
More Free Resources
Ready to Start Your Free ASE T1 Prep?
Review the study guide, practice key concepts, and use the free tools at your own pace.