Based on the Red Seal 310S Occupational Standard & official exam weighting
About the certification
In Ontario, Automotive Service Technician is trade code 310S, a compulsory Red Seal trade covering light vehicles — cars and light trucks, including hybrid and electric drive systems. This is distinct from heavy-duty truck work, which falls under the separate Truck and Transport Mechanic / Truck and Coach Technician Red Seal trades. The written Certificate of Qualification (C of Q) exam is administered by Skilled Trades Ontario. Since 310S is a Red Seal trade, Ontario's certifying exam is the interprovincial Red Seal Automotive Service Technician exam — passing it earns both your C of Q and the Red Seal endorsement.
The Red Seal exam has 125 multiple-choice questions with a 70% pass mark, and candidates are generally allotted up to about four hours. Per red-seal.ca's published exam breakdown, questions are distributed across 8 Major Work Activity blocks built from the Red Seal Occupational Standard (2023) and the Automotive Service Technician Occupational Analysis (2024).
ExamHub's free 310S practice quiz has 265 original questions across eight topic areas that mirror the official exam weighting, with an explanation and a cited source for every answer. It is unofficial study practice — always confirm current requirements with Skilled Trades Ontario and current OEM service information.
What's covered
Categories map to the Red Seal exam's Major Work Activity blocks, with steering/brakes/suspension and electrical & comfort control the most heavily weighted — just as they are on the real exam.
Try a few
Five questions pulled from the full bank, with the answer shown — use the quiz above for the real timed experience.
Why: The last digit of a misfire code identifies the specific cylinder — P0300 is the random/multiple misfire code, while P0301 through P0308 point at one numbered cylinder.
Why: Wheel speed sensors detect a wheel decelerating faster than the vehicle itself, and the ABS hydraulic unit rapidly reduces, holds, and reapplies pressure at that wheel many times per second to keep it rolling.
Why: A low-voltage signal wire runs through every HV connector in series; opening any one of them breaks that loop and the control module immediately shuts down the high-voltage system as a safety measure.
Why: Two 120-ohm terminating resistors at opposite ends of the bus sit in parallel, working out to roughly 60 ohms — a reading far off that suggests a missing or shorted terminator.
Why: Engine-driven impeller vanes fling transmission fluid at the turbine connected to the input shaft — no solid connection exists until the lockup clutch engages, which is what lets the engine idle in gear.
FAQ
The interprovincial Red Seal Automotive Service Technician exam has 125 multiple-choice questions, distributed across 8 Major Work Activity blocks per red-seal.ca's published exam breakdown. ExamHub's practice bank has 265 original questions, and the timed 'Test Me' mode draws a 125-question practice test matching the real exam's length.
The Red Seal exam pass mark is 70%. On the real 125-question exam that's about 88 correct; ExamHub uses the same 70% threshold.
Red Seal exams are generally allotted up to about 4 hours. ExamHub's Test Me mode gives you up to 4 hours, which is far more than most people need.
The Red Seal exam weighting is split across 8 blocks: common occupational skills, engine & engine support systems, vehicle module communications, driveline systems, electrical & comfort control systems, steering/suspension/braking/control systems/tires/hubs/wheel bearings, restraint systems & body components, and hybrid & electric vehicle systems.
No. 310S (Automotive Service Technician) covers light vehicles — cars and light trucks. 310T-scope heavy-duty work falls under the separate Truck and Transport Mechanic / Truck and Coach Technician Red Seal trades. This quiz covers the 310S light-vehicle scope only.
No. These are original questions written by ExamHub from the Red Seal Occupational Standard and established automotive trade theory. They cover the same topics but aren't copies of any real exam. Always verify against current OEM service information before relying on any value in the field.