Certifying authority: Skilled Trades Ontario (STO). Last checked 2026-09-10.
This trade is on Ontario’s compulsory list as Automotive Service Technician (310S). Under Skilled Trades Ontario, workers must hold a valid Certificate of Qualification, a Provisional Certificate of Qualification, or a Registered Training Agreement; journeypersons must renew their C of Q each year. Official list PDF is dated Feb 2022; the count of 23 still matches the current STO page.
Source: Skilled Trades Ontario — Compulsory Trades (23 trades)
Start with 10 free interactive Automotive Service Technician (310S) questions with worked explanations, or take a full 125-question timed mock exam weighted to the official RSOS breakdown.
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Whether it is required or not, the exam itself is the same paper everywhere in Canada. What your province decides is whether you must hold the certificate, how you apply, and where you sit it.
The Red Seal Occupational Standard sets the split below. It does not change by province.
| Major Work Activity | Weighting | Questions |
|---|---|---|
| MWA A: Performs Common Occupational Skills | 7% | 9 Qs |
| MWA B: Diagnoses and repairs engine and engine support systems | 18% | 22 Qs |
| MWA C: Diagnoses and repairs vehicle module communications systems | 10% | 12 Qs |
| MWA D: Diagnoses and repairs driveline systems | 14% | 17 Qs |
| MWA E: Diagnoses and repairs electrical and comfort control systems | 18% | 23 Qs |
| MWA F: Diagnoses and repairs steering and suspension, braking, control systems, tires, hubs and wheel bearings | 18% | 23 Qs |
| MWA G: Diagnoses and repairs restraint systems, body components, accessories and trim | 8% | 10 Qs |
| MWA H: Diagnoses and repairs hybrid and electric vehicles (EV) systems | 7% | 9 Qs |
Source: Red Seal Exam Breakdown — Automotive Service Technician (310S), red-seal.ca
4 hours, and a 70% pass mark (88/125). These are set provincially rather than by the Red Seal standard, and the four hours is the same whether your paper is 100 or 150 questions.
Confirmed against Skilled Trades Ontario’s Exam Preparation Guide and SkilledTradesBC. Check your own authority before exam day.
Click any option (A–D) below to grade yourself immediately and view the worked explanation:
On a WHMIS 2015 (GHS) Safety Data Sheet, flash point, autoignition temperature, vapour pressure and flammability limits are listed in Section 9, Physical and Chemical Properties. Section 5 covers how to fight a fire, Section 2 the hazard classes and pictograms, and Section 8 exposure limits and PPE.
The car was built in June 2025, so only the parts listed from April 2025 apply. It has no heated wheel, so part 103 fits. Part 102 is for cars built up to March 2025, and part 104 is for cars with a heated wheel; a newer number is not a replacement unless the catalogue says it supersedes.
With hands off, the torque sensor should read 0 ± 0.3 N·m. A 2.1 N·m reading makes the module add left assist, which steers the car left. Stability control does not brake a wheel while the car is parked, a binding joint or low voltage does not create a torque reading with hands off, and the tire swap ruled out the tires.
Booking is handled by Skilled Trades Ontario (STO); confirm current locations and dates with them.
Our Automotive Service Technician (310S) question bank is built to the official RSOS weighting above, with a worked explanation and code citation on every question.
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