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ASE® A-Series Certification Study Guide: A1 to A8

ASE automobile certification is earned one test at a time, so the way to study is one test at a time, in proportion to the question counts ASE publishes for each content area. Those counts are lopsided: diagnosis is 26 of the 45 scored questions on A2 and 18 of 45 on A1, while drum brakes are 5 of 45 on A5. This independent guide takes A1 to A8 in turn, says where the questions are and what gets missed, and gives a two-week plan for a single test.

This is an independent guide. ASE's own is The Official ASE Study Guide: ASE Automobile Tests, linked under 'What to study from' at the end of this page, and it is the first thing to read for any test you are sitting: it holds ASE's task lists and sample questions. The content-area descriptions below are our paraphrases; the question counts in them are ASE's.

The table below shows the eight tests as equal shares of 12.5%. That is only how this site lays eight separate tests out on one page. ASE publishes no weighting between tests, because each is a certification of its own, and you do not need to divide your time across all eight. Study the tests you have registered for. The proportions that matter are the ones inside each test.

Where the points are

The share of the exam each part of the current outline carries. Where the weights differ, study time should follow them.

DomainWeightTasks
A1Engine Repair12.5%5
A2Automatic Transmission/Transaxle12.5%3
A3Manual Drive Train and Axles12.5%6
A4Suspension and Steering12.5%4
A5Brakes12.5%4
A6Electrical/Electronic Systems12.5%5
A7Heating and Air Conditioning12.5%3
A8Engine Performance12.5%5

The ASE A-Series outline, task by task

A1Engine Repair12.5%

Diagnosis comes first: 18 of the 45 scored questions. Be able to say what each basic engine test tells you, a vacuum reading, a power balance test, a compression test and a cylinder leak-down test, and to trace a leak, a noise, a vibration or abnormal exhaust back to a cause. The supporting systems are next (9 questions on fuel, electrical, ignition, air induction and exhaust; 8 on lubrication and cooling), then cylinder head and valve train (6) and engine block (4).

  • A1.AGeneral engine diagnosis (18 of 45 scored): confirm the concern, trace leaks, noises, vibrations and abnormal exhaust, and interpret vacuum, power balance, compression, leak-down and electronic test results.
  • A1.BCylinder head and valve train (6 of 45): remove, inspect and service heads, valves, seats, springs, lifters, camshafts and cam drives, and set valve lash and valve timing.
  • A1.CEngine block (4 of 45): disassemble, inspect, measure and reassemble the block and its rotating and reciprocating parts.
  • A1.DLubrication and cooling systems (8 of 45): diagnose and repair oil pressure, oil delivery and cooling system faults.
  • A1.EFuel, electrical, ignition, air induction and exhaust systems (9 of 45): diagnose engine problems caused by faults in these supporting systems and service their components.

Where people lose points: Studying in proportion to the labor instead of the questions. Head and block work together are 10 questions; diagnosis alone is 18. Within diagnosis, know what separates one test result from another: a low compression reading that comes up when oil is added to the cylinder points toward the rings, and one that does not points toward the valves or head gasket. In a leak-down test, where the air escapes tells you which.

A2Automatic Transmission/Transaxle12.5%

More than half of this test is diagnosis: 26 of 45 scored questions, covering general, mechanical and hydraulic, and electronic control faults. In-vehicle maintenance and repair is 12 and removal, inspection and installation is 7. Practice working a complaint in order: confirm it, check fluid level and condition, read codes and scan data, and only then decide whether the fault is electronic, hydraulic or mechanical.

  • A2.ATransmission/transaxle diagnosis (26 of 45 scored): identify the transmission type and diagnose general, mechanical/hydraulic and electronic control faults.
  • A2.BIn-vehicle maintenance and repair (12 of 45): service shift linkage and range sensors, external seals, pans, coolers, valve bodies and other parts reachable with the unit in the vehicle.
  • A2.CRemoval, inspection and installation (7 of 45): remove and reinstall the unit, and inspect the flexplate, torque converter, cooler circuit and mounts along the way.

Where people lose points: Options that go straight to removing or rebuilding the unit before the basic checks have been made. When a question gives you fluid condition, a code or a pressure reading, the right answer has to fit that evidence. Keep electronic causes, a sensor, a solenoid, wiring or the control module, apart from hydraulic and mechanical ones: the same harsh or late shift can come from either side.

A3Manual Drive Train and Axles12.5%

The most evenly spread test of the eight. Its 40 scored questions are split between clutch (6), transmission (7), transaxle (7), drive shafts, half-shafts and joints (5), drive axle (7) and four-wheel and all-wheel drive components (8). No area is large enough to carry you and none is small enough to leave out.

  • A3.AClutch (6 of 40 scored): diagnose noise, slippage, chatter and release problems, and service clutch linkage, hydraulics, release bearing and related parts.
  • A3.BTransmission (7 of 40): diagnose noise, hard shifting, gear clash, jumping out of gear and leaks, and repair manual transmissions and their shift mechanisms.
  • A3.CTransaxle (7 of 40): diagnose and repair manual transaxle faults.
  • A3.DDrive shaft, half-shaft, universal joint and CV joint, front and rear wheel drive (5 of 40): diagnose and repair noise, vibration and wear.
  • A3.EDrive axle (7 of 40): diagnose and repair drive axle assemblies.
  • A3.FFour-wheel drive and all-wheel drive components (8 of 40): diagnose noise, vibration, leaks and steering complaints and repair the drive system components.

Where people lose points: Noise questions, which turn on when the noise happens. A noise that appears when the clutch pedal is pressed and one that appears when it is released point to different bearings, and a noise that changes in a turn points somewhere different from one that changes with load. Read the condition before the options. This is also one of the two tightest clocks in the series, at 50 questions in 60 minutes.

A4Suspension and Steering12.5%

Three areas of nearly equal size, steering (12), suspension (12) and wheel alignment (11), plus wheels and tires (5). For alignment, be able to say what each angle is, what a wrong value does to the way the vehicle drives and to the tires, and in what order angles are measured and adjusted. For wheels and tires, read wear patterns and tell a balance problem from runout.

  • A4.ASteering systems (12 of 40 scored): diagnose and repair steering system faults.
  • A4.BSuspension systems (12 of 40): diagnose and repair suspension system faults.
  • A4.CWheel alignment (11 of 40): diagnose alignment-related complaints, then measure and adjust alignment angles and make the related repairs.
  • A4.DWheels and tires (5 of 40): read tire wear patterns, diagnose vibration, runout and pull, and inspect, inflate, rotate, mount and balance tires.

Where people lose points: Mixing up what each alignment angle does. Camber and toe are the angles that wear tires; caster affects straight-line stability, steering return and pull, and is not normally a tire-wearing angle. A question that describes a pull with even tire wear and one that describes wear with no pull are asking about different angles. Like A3, this test gives 60 minutes for 50 questions.

A5Brakes12.5%

The hydraulic system, power assist and parking brake are the core: 19 of 45 scored questions. Disc brakes are 11, electronic brake control (antilock, traction control and stability control) is 10, and drum brakes are 5. Be able to follow hydraulic pressure from the master cylinder to the wheel and to say what each component failure does to the pedal.

  • A5.AHydraulic, power assist and parking brake systems (19 of 45 scored): diagnose and repair the hydraulic circuit, the power assist unit and the parking brake.
  • A5.BDrum brakes (5 of 45): diagnose and repair drum brake assemblies.
  • A5.CDisc brakes (11 of 45): diagnose and repair disc brake assemblies.
  • A5.DElectronic brake control (10 of 45): diagnose and repair antilock brake, traction control and electronic stability control systems.

Where people lose points: Pedal-feel questions. A spongy pedal, a pedal that sinks slowly under steady pressure, a hard pedal and a pulsating pedal each point to a different part of the system, and the options usually list all of them. Learn them as a set. And put the time where the questions are: electronic brake control has twice as many questions as drum brakes.

A6Electrical/Electronic Systems12.5%

The longest sitting in the series: 60 questions in 90 minutes, 50 scored. Body electrical systems are the largest area (17), then general electrical diagnosis (13), battery and starting (9), lighting (6) and charging (5). Start with general diagnosis even though it is not the largest, because every other area is that skill applied to a particular circuit: measuring voltage, voltage drop, current and resistance, and locating an open, a short, a ground fault or a high resistance.

  • A6.AGeneral electrical/electronic diagnosis (13 of 50 scored): measure voltage, voltage drop, current, resistance and waveforms, use scan tool data and codes, and locate opens, shorts, grounds and high resistance.
  • A6.BBattery and starting system (9 of 50): test, service and repair batteries and starting circuits.
  • A6.CCharging system (5 of 50): diagnose and repair charging system faults.
  • A6.DLighting systems (6 of 50): diagnose and repair vehicle lighting circuits.
  • A6.EBody electrical systems (17 of 50): diagnose and repair instrumentation and infotainment, comfort and convenience accessories, heated and cooled accessories, anti-theft systems and safety systems.

Where people lose points: Voltage drop. It is measured across part of a circuit while the circuit is operating and carrying current; a resistance check is made with the circuit switched off. A connection can pass a resistance check and still fail under load, and questions give you meter readings and ask what they prove. Know the three basic faults by their symptoms as well: an open stops the circuit working, a short to ground tends to blow the fuse, and unwanted resistance makes a load work weakly.

A7Heating and Air Conditioning12.5%

Two large areas of almost equal size. System service, diagnosis and repair, including the engine cooling system and refrigerant recovery, evacuation and charging, is 21 of 50 scored questions. Operating systems and controls, the blower, compressor, fan and climate-control actuator circuits, is 19. Refrigeration components such as the compressor, evaporator and condenser are 10.

  • A7.AHVAC and engine cooling system service, diagnosis and repair (21 of 50 scored): performance and leak test the system, interpret pressures and temperatures, and recover, evacuate, charge and correctly handle refrigerant and lubricant.
  • A7.BRefrigeration system components (10 of 50): diagnose and repair the compressor and clutch, and the evaporator, condenser and related components.
  • A7.COperating systems and related controls (19 of 50): diagnose and repair electrical and vacuum/mechanical HVAC controls, including blower, compressor, fan and climate-control actuator circuits.

Where people lose points: Treating this as a refrigerant test. Nineteen questions are about controls, which is electrical diagnosis in an HVAC setting. In the service area, practice reading high-side and low-side pressures together with temperatures, because one reading alone seldom identifies the fault. A note on ASE's guide: its A7 table prints a total of 40, but the three areas add up to 50, and both the guide's test-length table and ASE's web page say 50 scored.

A8Engine Performance12.5%

Half the scored questions are about diagnostic method: computerized engine controls (13) and general diagnosis (12). The rest are fuel, air induction and exhaust (9), ignition (8) and emissions controls (8). ASE breaks the emissions area down to the question: evaporative emissions 3, exhaust gas recirculation 2, secondary air injection and catalytic converter 2, positive crankcase ventilation 1.

  • A8.AGeneral diagnosis (12 of 50 scored): diagnose driveability and engine performance concerns using inspection and engine tests.
  • A8.BIgnition system (8 of 50): diagnose and repair ignition system faults.
  • A8.CFuel, air induction and exhaust systems (9 of 50): diagnose and repair starting, idle, mixture, misfire, power-loss and economy problems on port and direct injection engines.
  • A8.DEmissions control systems (8 of 50): diagnose and repair positive crankcase ventilation (1), exhaust gas recirculation (2), secondary air injection and catalytic converter (2) and evaporative emissions controls (3).
  • A8.EComputerized engine controls (13 of 50): retrieve codes, monitor status and freeze-frame data, diagnose faults with and without codes, and test sensors, actuators, circuits and control modules.

Where people lose points: Reading a trouble code as the name of a failed part. A code identifies a circuit or a condition the control module detected. The questions ask for the next test, or the most likely cause given the freeze-frame and scan data, and the computerized-controls area includes diagnosing faults when no code is stored at all. Much of this test builds on A6: if electrical diagnosis is weak, study it first.

A study plan

  1. Before you start: choose the tests and check the calendar

    A purchased test must be scheduled and taken within 90 days, and after any result ASE makes you wait 30 full days before buying the same test again. Register for what you can prepare in that window. The free 25-question diagnostic touches all eight tests; read its result only for the ones you are sitting.

  2. Days 1 and 2: ASE's own task list

    Open the official study guide at your test and read the task list under each content area. Mark every task you do not perform regularly at work. Those marks, not the chapter order of a textbook, are your syllabus.

  3. Days 3 to 7: the largest content area

    Give the first working week to the area with the most questions: general diagnosis on A1, transmission diagnosis on A2, hydraulic, power assist and parking brake systems on A5, body electrical together with general diagnosis on A6. Work practice questions in tutor mode and read the reason for every option.

  4. Days 8 to 11: the remaining areas, by question count

    Take the other content areas in descending order of ASE's counts and give each time in proportion. A 5-question area deserves an evening, not a week.

  5. Days 12 and 13: one timed test at the real length

    Sit a full-length practice test with the real numbers for your test. For A1 that is 55 questions in 75 minutes; the overview table on the ASE test page gives the others. Review every miss the next day and sort the misses by content area.

  6. Day 14, then the next test

    Spend the last day on the area the timed test exposed. If you are sitting more than one test, start the cycle again for the next one; areas that overlap, such as electrical diagnosis, will go faster the second time.

The free ASE A-Series diagnostic is being prepared and is not open yet. The exam facts and the content outline on this page are current.

If you are working toward all eight

Each test stands alone, so the order is yours. Two things make some orders easier than others. First, start with the system you work on most days: a pass on familiar ground teaches you how ASE asks questions before you meet unfamiliar content.

Second, electrical diagnosis recurs. It is the whole of A6, and it comes back in A8's computerized engine controls, A7's control circuits, A5's electronic brake control and A2's electronic transmission controls. Taking A6 early pays for itself several times. A1 and A8 also share ground, since A1 has 9 questions on the fuel, electrical, ignition, induction and exhaust systems that A8 covers in depth.

Use ASE's counts as your budget

Because ASE prints a question count beside every content area, you can turn the outline into a time budget with simple arithmetic. On A2, diagnosis is 26 of 45 scored questions, or 58% of the test. On A4, wheels and tires are 5 of 40, or 12.5%. If you have twenty hours for a test, those figures tell you roughly how many belong to each area.

The counts are for scored questions. Every test also has 10 unscored questions, which are not identified, so on the day there is no way to tell them from the rest.

The two-technician question

Many questions on this site are written in the style ASE's sample questions use: Technician A says one thing, Technician B says another, and you choose between A only, B only, both and neither. The reliable method is to cover the options and judge each statement on its own as true or false. Two true statements make 'both'; the common error is to pick the technician whose statement sounds more thorough when the other is also correct.

What the experience requirement means for studying

ASE grants certification only after two years of documented hands-on experience, with formal training able to count for part of it, and the content areas are diagnosis and repair as a working technician meets them. If you are testing before you have the experience, which ASE allows, expect to lean harder on a textbook for the systems you have not yet worked on. The three textbooks in the reference list below are general automotive texts; ASE does not prescribe them.

Check the numbers in older material

ASE's current study guide gives lower question counts than many websites and older books still quote. A1, for instance, is 55 questions with 45 scored, not 60 with 50. If your study material's content-area counts do not match the ones on this page, check them against ASE's current guide before you build a plan around them.

What to study from

These are the sources the questions in the bank cite. The outline in force is the The Official ASE Study Guide: ASE Automobile Tests (copyright 2026; PDF dated December 2025).

ASE A-Series study guide: common questions

Is this the official ASE study guide?

No. This is an independent guide. The official one is The Official ASE Study Guide: ASE Automobile Tests, published by ASE and linked in the references on this page. It contains the test specifications, task lists and sample questions, and you should read it alongside this page.

Is this ASE study guide free?

Yes. This page is free, and so is the 25-question diagnostic, which needs no account. The paid pass adds the full question bank for all eight tests and timed full-length practice.

How long should I study for an ASE test?

ASE sets no study period. Two weeks for a single test is a workable plan for a technician who works on that system; allow longer for a system you rarely touch. Keep in mind that a purchased test has to be taken within 90 days.

Which ASE test should I take first?

The one closest to your daily work. After that, A6 Electrical/Electronic Systems is worth taking early, because electrical diagnosis comes back in A2, A5, A7 and A8.

What should I study for the ASE A1 test?

General engine diagnosis first, which is 18 of the 45 scored questions, then the fuel, electrical, ignition, induction and exhaust area (9) and lubrication and cooling (8). Cylinder head and valve train is 6 questions and engine block is 4.

How many questions do I need to get right to pass an ASE test?

ASE's guides do not state a fixed passing percentage, and we do not quote one. Each test is reported as Pass or Fail. Use practice results to find weak content areas, not to predict a result.

ASE® is a registered trademark of the National Institute for Automotive Service Excellence. This site is an independent study resource and is not affiliated with, endorsed by, or sponsored by ASE. Practice questions here are original and are not actual ASE test questions.