- A4 is 50 questions (40 scored, 10 unscored research) in 60 minutes at Prometric centers.
- Steering Systems and Suspension Systems each carry 12 scored questions - your two biggest study targets.
- 2026 pricing is a $34 order registration fee plus $62 for the A4 test itself.
- You need two years of hands-on experience, or a two-year automotive degree to satisfy it fully.
Quick Facts Snapshot
If you only have five minutes before you need to know everything about the ASE Automobile and Light Truck Certification Test A4: Suspension and Steering, this is the section to read twice. A4 is administered by the National Institute for Automotive Service Excellence (ASE) and delivered at more than 450 Prometric test centers across the United States and Canada. Initial certification attempts must be taken in person - online remote proctoring is reserved strictly for recertification testing, so don't plan on testing from your kitchen table the first time around.
The exam itself is 50 total questions, but only 40 are scored. The other 10 are unidentified research questions ASE uses to evaluate future test content, and they don't count for or against you. You get 60 minutes to finish all 50. For a deeper walkthrough of how these numbers translate into a passing result, see A4 Passing Score 2026: Exactly What You Need to Pass.
Domain Breakdown at a Glance
A4 content is organized into four domains, and knowing their relative weight tells you exactly where to spend your study hours. For a full walkthrough of each content area, check A4 Exam Domains 2026: Complete Guide to All 4 Content Areas.
| Domain | Weight | Approx. Scored Questions |
|---|---|---|
| Steering Systems Diagnosis and Repair | 30% | 12 |
| Suspension Systems Diagnosis and Repair | 30% | 12 |
| Wheel Alignment Diagnosis, Adjustment, and Repair | 28% | ~11 |
| Wheel and Tire Diagnosis and Service | 12% | ~5 |
Notice that Steering Systems and Suspension Systems together make up 60% of the exam and 12 scored questions apiece - the two heaviest single content areas on the entire test. Alignment isn't far behind at 28%, which means these three domains combine for the overwhelming majority of your score. Wheel and Tire Diagnosis is the smallest slice, but it's still worth locking down since every scored question matters equally.
Steering Systems Must-Knows
Steering Systems Diagnosis and Repair (30%)
This domain covers the full path from the steering wheel to the road wheels, including how power assist is generated and delivered.
- Steering columns, including tilt/telescoping mechanisms and their diagnostic checks
- Hydraulic power steering units - pumps, hoses, fluid, and pressure testing
- Electric power steering (EPS) units and their sensor/control inputs
- Steering linkage components: tie rods, idler arms, pitman arms, and rack-and-pinion assemblies
Because hydraulic and electric power steering units are both explicitly named in this domain, don't assume a modern-only or classic-only study approach will work - you need comfort diagnosing both architectures side by side.
Suspension Systems Must-Knows
Suspension Systems Diagnosis and Repair (30%)
Tied with Steering Systems as the largest domain, this section tests your ability to diagnose ride and handling components front and rear.
- Front suspension components: control arms, ball joints, struts, and springs
- Rear suspension components across independent and solid-axle designs
- Electronically controlled ride systems, including sensors and ride-height adjustment
- Bushings, mounts, and related noise/vibration diagnosis
Key Takeaway
Steering Systems and Suspension Systems combined equal 60% of your scored questions - treat them as your primary study blocks, not an afterthought behind alignment.
Alignment and Wheel/Tire Quick Hits
Wheel Alignment Diagnosis, Adjustment, and Repair sits at 28%, close behind the two leading domains. Expect questions on camber, caster, and toe adjustment, alignment angle diagnosis, and how worn or damaged components throw alignment out of spec. Wheel and Tire Diagnosis and Service, at 12%, rounds out the exam with tire wear pattern analysis, wheel runout, balancing, and TPMS-related service concerns.
Together, these two domains reinforce material from Steering and Suspension - a bad tie rod or worn control arm doesn't just fail a component check, it also throws off alignment readings and tire wear. Studying these domains in isolation from each other is a common mistake; A4 rewards candidates who can connect symptoms across systems.
Test Format and Scoring Mechanics
A4 uses scaled scoring, meaning your raw number of correct answers is converted to a scale, and the pass point is set by a panel of working technicians and subject-matter experts rather than a fixed percentage like 70% or 80%. This is a detail many candidates misunderstand - for the full explanation, see A4 Passing Score 2026: Exactly What You Need to Pass and How Hard Is the A4 Exam? Complete Difficulty Guide 2026.
Recertification works differently: the A4R version is only 20 questions with 30 minutes of testing time, roughly half the length of the initial test. If you're already ASE-certified in A4 and approaching your five-year expiration, plan your review time accordingly since A4R is a shorter, faster exam.
Registration, Fees, and Deadlines
Budgeting for A4 in 2026 means accounting for two separate charges: a $34 registration fee charged per order, plus $62 for the A4 test itself. Sales tax is collected in many states on top of these amounts. A full cost breakdown, including how these fees stack across multiple tests, is available at A4 Certification Cost 2026: Complete Pricing Breakdown.
- Refunds are available for untaken, unexpired tests cancelled within 90 days of purchase
- Test purchases must be scheduled and taken within 90 days of purchase
- Certification is valid for five years from the date earned
- Renewal options: the A4R recertification test, or the ASE Renewal App at $52 per year
Missing your 90-day testing window means forfeiting that attempt, so don't purchase the test until you have a realistic date in mind. Scheduling logistics, including how to pick a Prometric location, are covered in A4 Exam Dates 2026: Testing Windows, Deadlines & Scheduling.
Eligibility Checklist
Before you can hold the credential, ASE requires two years of documented hands-on repair technician work experience. Relevant formal training can substitute for up to one year of that requirement, and a two-year accredited automotive degree can satisfy the entire two-year requirement on its own. Full details, including how to document experience, are in A4 Requirements 2026: Eligibility, Prerequisites & How to Qualify.
- You may take the test before your work experience form is approved
- Your certificate, however, is withheld until ASE reviews and approves that documentation
- A4 is one of eight tests (A1-A8) required for ASE Master Automobile Technician status
That last point matters for career planning: shops and dealerships hiring for suspension and alignment specialist roles often view A4 as part of a broader Master Technician track rather than a standalone credential. If you're weighing whether to pursue it alongside other tests, Is the A4 Certification Worth It? Complete ROI Analysis 2026 and A4 Jobs break down where this certification fits into hiring conversations.
Final-Week Review Plan
With four domains and clear weightings, your last stretch of prep should mirror the exam's own emphasis rather than treat every topic equally.
Steering Systems
- Review steering columns, hydraulic and electric power steering units, and linkage components - 12 scored questions ride on this domain
Suspension Systems
- Drill front and rear suspension components and electronically controlled ride systems, matched in weight to Steering
Alignment and Wheel/Tire
- Cover camber/caster/toe adjustment plus tire wear diagnosis, the two remaining domains at 28% and 12%
Mixed Review
- Run timed practice questions across all four domains to simulate the 60-minute, 50-question format
If you want a longer, structured plan rather than a final-week sprint, A4 Study Guide 2026: How to Pass on Your First Attempt walks through a multi-week schedule built around these same domain weights. And if you'd rather see how other candidates have fared, A4 Pass Rate 2026: What the Data Shows puts this exam's difficulty in context.
For hands-on repetition under exam-like conditions, running through timed question sets on our A4 practice test platform before test day helps you get comfortable with the Technician A/Technician B and EXCEPT/LEAST LIKELY formats you'll actually see at Prometric.
FAQ
The A4 exam has 50 total questions, 40 of which are scored and 10 of which are unidentified research questions. You have 60 minutes to complete the full test.
Steering Systems Diagnosis and Repair and Suspension Systems Diagnosis and Repair are each weighted at 30% and carry 12 scored questions apiece, making them the two biggest domains on the exam.
No. Initial certification tests must be taken in person at a Prometric test center. Online remote proctoring is available only for recertification tests such as A4R.
Budget for a $34 registration fee per order plus $62 for the A4 test itself, with sales tax collected in many states. Refunds apply to untaken, unexpired tests cancelled within 90 days.
A4 certification is valid for five years. You can renew through the shorter A4R recertification test (20 questions, 30 minutes) or the ASE Renewal App at $52 per year.
Keep this page bookmarked as your quick-reference sheet, and pair it with the deeper dives linked above - starting with A4 Certification or What Is A4 Certification? if you're still mapping out the full picture before test day.