ASE Maintenance and Light Repair (MLR) Certification Practice Test

These questions are part of the practice quiz. Start practicing

• How often should the cabin air filter be replaced?
• What is the appropriate gauge size for a fusible link?
• To locate a red, oily fluid leak under a vehicle with an automatic transaxle, what method does a technician use?
• When bleeding brakes on a vehicle with a disc/drum system, which statement is correct?
• A customer states that the left front tire loses air. Which of the following is NOT a potential cause?
• What does the term "hot start" refer to?
• What could cause milky lubricant in the front differential of a four-wheel drive vehicle?
• What might an illuminated check engine light suggest?
• What does the check engine light typically indicate?
• During a cylinder leakage test, hearing air from the exhaust pipe indicates which potential problem?
• What does amperage refer to in electrical terms?
• Which of the following is NOT a function of lubricating oil in an engine?
• What is the purpose of the PCV valve in an engine?
• What is the function of the oil pump in an engine?
• A vehicle's battery prematurely fails and a charging system test shows a constant output of 16.0 volts. What does this indicate?
• If there is a pressure drop during a cooling system pressure test without visible leaks, what could this indicate?
• What is a common method for diagnosing a no-start condition?
• When retrieving diagnostic trouble codes (DTCs) from the PCM, which steps should be followed?
• What is the standard tire pressure range for most passenger vehicles?
• What could be a cause of multiple oil leaks in a limited-slip rear axle assembly according to Technician B?
• In the case of a brake system inspection, what is an important step before taking the vehicle back on the road?
• What is an example of a condition that can lead to a soft brake pedal?
• What should be done before removing the spark plug boot on a V-6 engine?
• Which component is typically inspected first when diagnosing a fluid leak in a power steering system?
• Which items should be checked during a pre-trip vehicle inspection?
• Technician A says that rosin-core solder should be used for electrical connections. Technician B states that a crimp and shrink connector can be used for repairs. Who is correct?
• What is the result of not replacing a worn oil filter?
• What is the necessary action when handling halogen bulbs during replacement?
• What could be a possible cause of a "hot start" issue?
• What can a plugged axle vent potentially cause in a rear axle assembly?
• What is the purpose of a multi-point inspection?
• Which component is essential for vehicle lubrication and proper functioning?
• What does it mean if a car engine is "knocking"?
• What can coolant leaks indicate?
• Which technician is correct about directional tires during rotation?
• What does Technician A observe when road testing brakes that could indicate issues?
• What can cause imbalanced wheels in a vehicle?
• How does the air intake system affect engine performance?
• What does Technician B suggest about the use of regular prescription eyewear in the lab?
• What is the purpose of checking vehicle fluid levels regularly?
• Why is it crucial to ensure that the thread pitch and diameter of a replacement wheel stud match the original?
• Which of the following indicates normal operation for brake warning indicators?
• What outcome might result from improper installation of manual transmission fluid?
• What is a common sign that indicates an engine may be overheating?
• If a customer complains of low airflow from the dash vent, what could be the cause?
• What is the purpose of a fusible link in a vehicle's electrical system according to Technician A?
• What is the recommended procedure for tightening lug nuts?
• What is the first step when diagnosing an AC system issue?
• Current flow in a circuit can be calculated by which formula?
• Why is it important to follow the manufacturer's maintenance schedule?
• What type of oil should be used in a high-mileage vehicle?
• What could cause a vehicle's red brake warning light to stay ON?
• When reinstalling the wheels on a vehicle after completing a brake service, what should be done?
• Which of these best describes the operation of a continuously variable transmission (CVT)?
• In checking for power steering fluid leaks, what should be observed during the inspection?
• What can restricted airflow in the air intake system lead to?
• What is the primary function of motor oil?
• What might you notice if a vehicle has a drivability issue related to stalling?
• What should be done if a vehicle's brakes feel spongy?
• What can a leaking heater core potentially cause in a vehicle?
• When reinstalling a wheel and tire assembly on a vehicle, how should the lug nuts be tightened?
• What is the overall reading of a Metric Micrometer with an upper sleeve reading of 5.0mm, a lower sleeve reading of 0.50mm, and a thimble reading of 0.01mm?
• How does the engine’s EGR system contribute to emissions control?
• What should be done if there is a suspected power steering fluid leak?
• Why is regular tire rotation recommended?
• When replacing a floating front brake caliper, which statement is correct regarding the installation?
• What is the function of a relay in a vehicle's electrical system?
• Who is correct regarding eye protection in the laboratory?
• If a vehicle fails a charging system output test, what is the recommended action?
• What is the purpose of the O2 sensor in an exhaust system?
• What benefit does tire rotation provide?
• What does a Vehicle Identification Number (VIN) signify?
• What primary purpose does a vehicle's alternator serve?
• Why is it important to have tire weight retaining clips matched to the rim profile?
• Which service is essential to ensure the longevity of tires?
• What is the primary purpose of using a self-powered test light with an airbag system?
• Which of the following is NOT a recommended safety procedure for automotive lifts?
• When replacing a vehicle's halogen headlamp bulbs, which technician statement is correct?
• How can you identify a worn-out brake pad?
• What is a potential effect of setting valve clearance too tightly on an engine?
• How is brake fluid typically assessed?
• Which of the following may indicate that a transmission is failing?
• What is the primary purpose of a catalytic converter?
• What effect does a worn wheel bearing have on a vehicle?
• While cycling the ignition key from the key OFF/engine OFF position to the key ON/engine OFF position, the red brake light comes ON and then turns OFF. What could this indicate?
• What is recommended for the condition of spark plug threads before installation?
• What does a battery warning light on the dashboard typically indicate?
• Which maintenance task is important for ensuring good brake function?
• How can a technician check for a vacuum leak in an engine?
• What type of fluid is primarily used in automatic transmissions?
• What is the primary purpose of lubricating the seal on a transmission filter during installation?
• In relation to tire maintenance, what could excessive run-out in the wheel cause?
• What happens when DTCs are cleared from the vehicle's computer?
• How is tire rotation typically performed?
• What is the primary function of a positive crankcase ventilation (PCV) system?
• Which agency is responsible for enforcing commercial workplace safety and environmental health regulations?
• What is the function of the thermostat in a cooling system?
• What is a common symptom of low engine oil?
• When removing both front wheels from a vehicle, what should be done according to Technician A?
• In a vehicle without a dipstick, how should the transmission fluid level be checked?
• What are the symptoms of a failing battery?
• In a scenario where the three C's (concern, cause, and correction) are being reviewed, who is correct regarding the customer's statement?
• What is the role of the differential in a vehicle?
• What is a critical factor to consider when changing brake fluid?
• Which technician is correct regarding power steering pump drive belts?
• What is the main purpose of a fuel filter?
• Why are small blisters in a rubber brake hose considered acceptable?
• To disable the airbag system, Technician A states that disconnecting the negative battery cable may be necessary. What does Technician B say?
• When changing spark plugs, what does Technician B recommend regarding the spark plug threads?
• What type of maintenance task is brake fluid replacement categorized as?
• What is the primary function of a wheel bearing?
• Which system in a vehicle controls emissions?
• What should a technician verify when changing an oil filter with a spin-on filter?
• If a driveshaft universal joint cannot have the retaining clip installed, what could be the cause?
• What might a technician listen for to diagnose an engine knock?
• Which component is often checked to assess engine performance?
• What does a fluctuation in the temperature gauge typically suggest?
• Which statement correctly describes the purpose of a fusible link?
• During a road test, what condition should a technician look for when assessing brake operation, according to Technician A?
• What could potentially happen if the power steering pump belt is too loose?
• Why is it important to inspect refrigerant levels in an AC system?
• What should a technician check if a vehicle's steering wheel feels loose?
• Which of the following factors does NOT cause a grabbing brake condition?
• Why is it important to use the correct coolant?
• When testing for a malfunctioning electrical circuit, what condition does the fusible link protect against?
• What maintenance procedure is essential after changing engine oil?
• How do you effectively bleed air from a brake system?
• How can you tell if a fuel injector is clogged?
• What is the recommended minimum tire tread depth for safe driving?
• What might indicate a successful pass of an emissions test?
• What component is essential to check in a no-start condition aside from the battery?
• What is an effect of improper tire inflation?
• What does it indicate if clear water drips onto the passenger side floor during turns?
• What issue can a restricted cabin air filter cause?
• Which part of the charging system is likely faulty when the output voltage is too high?
• Brake fluid must meet minimum standards set by which organization?
• What is the function of the brake booster?
• What is the relationship between the voltage, current, and resistance in a circuit?
• When should spark plugs typically be replaced?
• When soldering electrical connections, what advantage does using rosin-core solder provide?
• When servicing a transmission equipped with a filter, what must be done when installing the new filter?
• For a fully charged battery rated at 600 CCA, which current should be used at an ambient temperature of 70 degrees for 15 seconds?
• What should be done if a flexible rubber brake hose shows small cracks?
• What should you do if the engine oil looks dirty?
• What tools are necessary for performing a suspension alignment?
• What should be done before removing the fuel filter on a fuel-injected vehicle?
• Which action is not advised regarding inspecting brake components?
• Which component is crucial for timing the engine's fuel injection accurately?
• What is the main purpose of the fuel pump?
• Why should jack stands be used during vehicle repairs?
• A reading of 450 mV on a digital multimeter is equal to how many volts?
• A musty smell is emitting from the A/C vents. What might be the cause?
• Regarding the filling level of an automatic transmission, what can occur if it is overfilled?
• What symptom is commonly associated with a failing alternator?
• What does the term “drivability issue” refer to?
• What symptom might indicate that a brake pad is worn out?
• Where can the correct tire inflation pressure typically be found for a passenger vehicle?
• What could be the cause of the brake fluid level being at the "Min" mark in the master cylinder reservoir?
• What could cause a vehicle to pull to one side after tire rotation?
• During an instruction panel gauge test, the technician observes that the engine temperature gauge is reading 200 F (93 C) on a cold engine. Who is correct regarding the possible diagnosis?
• What does the number 205 indicate in the tire designation "P205/70R15"?
• What could cause difficulty in shifting gears after changing the manual transmission fluid?
• What tool is commonly used to check engine compression?
• What is a common consequence of low coolant levels in a vehicle?
• What symptom indicates air in the brake hydraulic system?
• What is the role of the ignition coil in an ignition system?
• What is an important factor to consider about the cabin air filter?
• What must be matched to the rim profile during tire rotation and balancing?
• What does a squeaking noise when braking often indicate?
• If a rear wheel stud is damaged, what should be verified about the replacement stud?
• While inspecting a vehicle's power steering, fluid leaks from the high-pressure hose crimp. What should the technician do to repair this?
• What does the presence of air bubbles in the radiator during a cylinder leakage test indicate?
• What should be done with any remaining diesel exhaust fluid (DEF) in the bottle after adjustment?
• What is commonly checked during a routine engine tune-up?
• What should you check if a vehicle pulls to one side while driving?
• Why is wheel alignment important for vehicle performance?
• Which type of curing occurs in the absence of air?
• What issue can a front end height that is 2 inches below manufacturer specifications cause?
• Which of the following is true regarding the installation of a new caliper?
• When adjusting valve lash on a four-cylinder engine, if the valve clearance is set too tight, which of the following could occur?
• What should be checked during the pre-trip inspection of a vehicle?
• How often should engine oil be changed under normal driving conditions?
• What should a technician check if a customer's vehicle is leaking transmission fluid?
• During a maintenance check, what indicates a potential cylinder head issue?
• What is a likely cause of a vehicle having a squealing noise that changes with engine speed?
• Before removing a vehicle from the lift after installing new brake pads, what should the technician do?
• How should you inspect a tire for damage?
• When replacing spark plugs, which of the following is NOT true?
• What type of maintenance is performed during a brake inspection?
• What does an engine's lubrication system primarily help with?
• What is the function of a timing belt in an engine?
• What is the purpose of the mass air flow (MAF) sensor?
• Which method is appropriate for rotating directional tires?
• When measuring the parallelism of a disc brake rotor, a technician finds a 0.002" variation. What is the next step?
• What value does a DMM reading of 368 on the mV scale represent?
• What element of high-mileage engine oil helps prevent leaks?
• What noise might indicate a worn serpentine belt?
• How does proper tire pressure affect vehicle performance?
• A technician observes excessive play in the inner tie rod. What does this indicate?
• What happens if the fuel pressure is not relieved before changing a fuel filter?
• In the event of a shop fire that cannot be contained, what is the best action to take?
• After replacing a coolant thermostat, the engine overheats. What could be a likely cause?
• If a cranking voltage drop test shows 1.6 volts, what should be the next step?
• Which color is used as a safety-warning indicator for SRS related connectors?