ASE G1 Auto Maintenance and Light Repair practice questions
211 free questions with answers and explanations.
- 101.During a routine inspection, a technician notes that the engine's exhaust manifold has a visible crack. Which of the following is the most likely consequence of this condition?Engine Systems
- 102.A technician is performing a pre-alignment inspection. They notice that the vehicle's ride height is significantly lower on one side compared to the other. What is the MOST immediate concern this condition raises regarding the alignment process?Suspension and Steering
- 103.A vehicle owner reports a noticeable decrease in fuel economy and a strong, unpleasant odor from the exhaust, often described as 'rotten eggs'. The check engine light is illuminated. Which component is most likely failing?Engine Systems
- 104.A vehicle with disc brakes on all four wheels exhibits a low brake pedal that feels 'mushy' and requires multiple pumps to build pressure. There are no visible fluid leaks. A technician suspects air in the hydraulic system. Which of the following is the MOST effective method to remove air from the brake system?Brakes
- 105.A vehicle with an electronic fuel injection system cranks but does not start. A technician confirms there is good spark and engine compression. When checking for fuel, the technician hears the fuel pump prime briefly when the key is turned to the 'ON' position, but no fuel pressure is detected at the fuel rail. What is the most likely cause?Engine Systems
- 106.A vehicle owner complains of a strong gasoline smell around their vehicle, especially after refueling. There are no visible leaks on the ground or from the fuel lines. A 'Check Engine' light is illuminated with DTC P0442 (Evaporative Emission System Leak Detected - Small Leak). What is the MOST likely cause?Engine Systems
- 107.A vehicle's parking brake system uses a cable-actuated drum-in-hat design on the rear wheels. The customer complains that the parking brake does not hold the vehicle effectively, even when pulled up all the way. A technician inspects the system and finds no broken cables or seized components. What is the MOST likely cause of this issue?Brakes
- 108.A vehicle's engine develops a noticeable ticking or tapping sound that seems to come from the top of the engine, especially prominent during cold starts and sometimes becoming quieter as the engine warms up. This noise does not typically change with engine RPM as dramatically as a rod knock. What is the most likely cause?Engine Systems
- 109.A technician is diagnosing an automotive HVAC system where the blower motor operates only on the 'HIGH' setting. All other settings produce no airflow. What is the MOST likely cause?Heating and Air Conditioning (HVAC)
- 110.A vehicle with an electronic parking brake (EPB) system has a warning light illuminated on the dashboard. The owner reports that the parking brake sometimes fails to engage or disengage. The technician connects a scan tool and finds a DTC indicating a 'Parking Brake Motor Circuit Malfunction'. What is the MOST likely cause?Brakes
- 111.A technician is inspecting a hybrid electric vehicle (HEV). Which of the following safety precautions is MOST critical before performing any service on the high-voltage system?Maintenance and Light Repair
- 112.A customer complains that their vehicle pulls sharply to the left when the brakes are applied. Upon inspection, the technician finds that the right front brake caliper is seized. What is the MOST likely reason for the vehicle pulling to the left?Brakes
- 113.A technician is performing a visual inspection of a vehicle's exhaust system. They notice a black, sooty residue around a joint between the exhaust manifold and the exhaust pipe. What does this residue indicate?Engine Systems
- 114.A vehicle owner complains that their engine runs rough, hesitates under acceleration, and emits black smoke from the exhaust. A scan tool reveals DTC P0172 (System Too Rich, Bank 1). Which of the following is the MOST likely cause?Engine Systems
- 115.After replacing the brake pads and rotors on a vehicle with drum rear brakes, the technician notices that the brake pedal feels lower than before, but there is no sponginess. The fluid level is full, and no leaks are present. What is the MOST likely cause?Brakes
- 116.A technician is performing a brake inspection on a rear drum brake system. They notice that one of the brake shoes is heavily contaminated with brake fluid. Which component is MOST likely leaking?Brakes
- 117.Which of the following statements about refrigerant recovery is TRUE according to EPA Section 609 regulations?Heating and Air Conditioning (HVAC)
- 118.A technician is inspecting a vehicle's brake system. They observe that the brake pedal requires excessive force to stop the vehicle, and the vehicle pulls to one side during braking. Upon inspection, they find that one of the front caliper pistons is seized. Which of the following is the MOST likely cause of these symptoms?Brakes
- 119.When performing an oil change, a technician notices significant metallic particles (shavings) in the old engine oil. What does this condition most likely indicate?Engine Systems
- 120.After replacing the brake pads and rotors on a vehicle with front disc and rear drum brakes, the technician notices that the brake pedal feels lower than normal and requires more travel before the brakes engage effectively. What is the MOST likely cause of this condition?Brakes
- 121.A vehicle's engine consistently runs at a higher-than-normal temperature, and the upper radiator hose is very hot and firm, while the lower radiator hose remains relatively cool. The coolant level is full. What is the MOST likely cause?Engine Systems
- 122.During a routine inspection, a technician notes that the brake fluid in the master cylinder reservoir is dark and murky. What is the MOST appropriate action to take?Brakes
- 123.A technician is inspecting a vehicle's rear suspension with a solid axle. They observe that the leaf springs are sagging significantly on one side, causing the vehicle to sit noticeably lower on that side. Which of the following is the MOST appropriate initial action for the technician to take?Suspension and Steering
- 124.A technician is checking the exhaust system for leaks. Which of the following methods is generally considered the most effective and safest for locating small exhaust leaks?Engine Systems
- 125.A technician is diagnosing an engine that cranks normally but will not start. They have confirmed there is good spark and fuel pressure. Which of the following tests should the technician perform NEXT to determine the cause of the no-start condition?Engine Systems
- 126.During a wheel alignment, a technician finds that the vehicle's thrust angle is significantly out of specification. All other alignment angles (camber, caster, toe) appear to be within acceptable ranges. What is the most likely cause of an incorrect thrust angle?Suspension and Steering
- 127.A vehicle exhibits a pull to one side during braking, but not during normal driving. The most likely cause is a fault in which of the following systems?Suspension and Steering
- 128.Which component is responsible for converting mechanical force from the brake pedal into hydraulic pressure to actuate the brakes?Brakes
- 129.A technician is performing a pre-alignment inspection on a vehicle. Which of the following conditions, if found, would most likely prevent a proper wheel alignment?Maintenance and Light Repair
- 130.A technician is preparing to recover R-134a refrigerant from a vehicle's AC system. According to EPA Section 609 regulations, which of the following is a mandatory requirement for the recovery equipment used?Heating and Air Conditioning (HVAC)
- 131.A technician is inspecting a vehicle's front suspension. They notice excessive play when manipulating the wheel at the 12 and 6 o'clock positions. The most likely cause of this condition is:Suspension and Steering
- 132.A technician is inspecting a front-wheel-drive vehicle and notices that the CV joint boots on both front axles are torn and leaking grease. The customer reports hearing a 'clicking' or 'popping' noise during turns. Which of the following is the most appropriate repair action?Suspension and Steering
- 133.A technician is performing a battery test using a battery load tester. The battery's CCA rating is 600. For a proper load test, what amperage should the tester apply for 15 seconds?Maintenance and Light Repair
- 134.A vehicle owner reports a loud, high-pitched squealing noise coming from the engine compartment, especially noticeable during cold starts and when turning the steering wheel sharply. The noise often subsides as the engine warms up. Which of the following is the most likely cause?Engine Systems
- 135.A vehicle owner reports a noticeable decrease in engine power, especially during acceleration, and the exhaust emits a strong, pungent odor similar to rotten eggs. Which of the following components is most likely failing?Engine Systems
- 136.A vehicle owner reports that their engine frequently overheats when idling in traffic, but the temperature returns to normal once the vehicle is moving. What is the most likely cause of this issue?Engine Systems
- 137.A customer complains that their vehicle's ABS warning light illuminates intermittently, especially when driving over rough or bumpy roads. The technician retrieves no stored Diagnostic Trouble Codes (DTCs) from the ABS module. Which of the following is the MOST likely cause?Brakes
- 138.During a pre-alignment inspection, a technician finds that the vehicle's left front camber is -1.5 degrees, while the specification is 0.0 +/- 0.5 degrees. The MOST likely cause, assuming no collision damage, is:Suspension and Steering
- 139.A technician is performing a diagnostic check on a vehicle's ABS system due to an intermittent warning light. During a road test, the technician notices that the ABS light illuminates only when turning sharply to the left. No DTCs are stored in the ABS module. Which of the following is the MOST likely cause?Brakes
- 140.Which of the following is the PRIMARY function of a proportioning valve in a hydraulic brake system?Brakes
- 141.A technician is diagnosing an Antilock Brake System (ABS) with an illuminated warning light. The scan tool shows a fault code indicating a 'Left Front Wheel Speed Sensor Open Circuit'. Which of the following is the MOST likely cause?Brakes
- 142.A technician is performing a wheel alignment on a vehicle with non-adjustable rear suspension. After adjusting the front, they find that the total toe is within specification, but individual rear toe is out on one side. What is the MOST likely cause?Suspension and Steering
- 143.A technician is performing a tire rotation on a front-wheel-drive (FWD) vehicle. Which of the following rotation patterns is generally recommended by manufacturers for FWD vehicles?Maintenance and Light Repair
- 144.A vehicle is brought into the shop with a complaint of a rough idle, reduced engine power, and a 'Check Engine' light illuminated. A scan tool shows a P0303 diagnostic trouble code. Which of the following is the most isolated and direct cause of this specific DTC?Engine Systems
- 145.A technician is diagnosing a vehicle that cranks normally but does not start. They have confirmed good spark and adequate fuel pressure. When checking for injector pulse using a noid light, they observe no flashing. Which of the following is the MOST likely cause?Engine Systems
- 146.A technician is performing a multi-point inspection. Which of the following fluid levels should be checked with the engine running and at operating temperature?Maintenance and Light Repair
- 147.During a pre-purchase inspection of a four-wheel-drive (4WD) vehicle, a technician observes that the front and rear driveshafts are rotating at different speeds while driving in a straight line on dry pavement in 4WD HIGH. This condition is NORMAL for which type of 4WD system?Manual Drive Train and Axles
- 148.A technician is performing a differential backlash measurement. The specification is 0.005-0.008 inches. The technician measures 0.015 inches. What is the MOST appropriate corrective action?Manual Drive Train and Axles
- 149.A vehicle with a manual transmission exhibits difficulty shifting into any gear when the engine is running, but shifts smoothly when the engine is off. The clutch pedal feels normal and has proper free play. Which of the following is the MOST likely cause?Manual Drive Train and Axles
- 150.A technician is diagnosing a complaint of excessive driveline vibration that intensifies with vehicle speed. Upon inspection, they notice that one of the driveshaft's universal joints (U-joints) has visible rust and appears stiff when articulated by hand. What is the MOST likely cause of the vibration?Manual Drive Train and Axles