ASE certification study guide Exam
2025 Questions and Answers
Spark plugs are being replaced on a v6 engine. Which of the following should be performed before
removing the boot? - ANSWER✔✔-Twist the boot 1/2 a turn
Technician A days that a positive crankcase ventilation (pvc) system reduces vehicle emissions. Tech
B says that a pvc system helps increase crankcase pressure. Who is correct? - ANSWER✔✔-Tech A
Tech A says that secondary ignition wires should be inspected when replacing spark plugs. Tech B
says that if a new spark plug is dropped it can be used as long as the gap doesn't change. Who is
correct? - ANSWER✔✔-Tech A
Incorrect valve timing could be caused by... - ANSWER✔✔-Incorrect timing belt position
When measuring parallelism of a disc brake rotor, A technician measures 0.002" variation beyond
the specification. The next step is to? - ANSWER✔✔-Determine the minimum rotor machine to
thickness
Tech A says that disconnecting the negative battery cable may be required to disable the air bag
system. Tech B says that a self powered test light can be used to test air bag system components.
Who is correct? - ANSWER✔✔-Tech A only
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 1
, A vehicles battery prematurely fails. A charging system output test shows the alternator is producing
a constant 16.0 volts. This could indicate a failed... - ANSWER✔✔-Voltage regulator
A dirty cabin air filter can cause... - ANSWER✔✔-A musty smelling cabin
Define the term stroke - ANSWER✔✔-Distance the piston travels from TDC (top dead center) to
BDC (bottom dead center)
A vehicle is being checked for power steering leaks Technician A says that leaks can develop in the
fitting hoses and seals, Technician B says that the steering components should be observed for leaks
while a helper turns the steering wheel from side to side. Who is right? - ANSWER✔✔-Both
Brake fluid must meet minimum standards set by... - ANSWER✔✔-Department of traffic (DOT)
A flexible rubber brake line is being inspected.
Technician A says small blisters in the rubber are acceptable if they are not leaking.
Technician B says that small cracks in the rubber require replacement of the hose.
Who is correct? - ANSWER✔✔-Technician B only
A technician is preforming a service on a vehicle there is a risk of splashing liquid. Technician A says
that regular safety glasses with side shields will work. Tech B says that goggles combined with a face
shield will provide adequate protection. Who is correct? - ANSWER✔✔-Tech B
A band type TPMS (tire pressure monitor system) is being installed in the center of the rim. How
many degrees form the valve stem should the sensor be mounted? - ANSWER✔✔-180 (sensor and
valve stem should be parallel with each other)
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 2
2025 Questions and Answers
Spark plugs are being replaced on a v6 engine. Which of the following should be performed before
removing the boot? - ANSWER✔✔-Twist the boot 1/2 a turn
Technician A days that a positive crankcase ventilation (pvc) system reduces vehicle emissions. Tech
B says that a pvc system helps increase crankcase pressure. Who is correct? - ANSWER✔✔-Tech A
Tech A says that secondary ignition wires should be inspected when replacing spark plugs. Tech B
says that if a new spark plug is dropped it can be used as long as the gap doesn't change. Who is
correct? - ANSWER✔✔-Tech A
Incorrect valve timing could be caused by... - ANSWER✔✔-Incorrect timing belt position
When measuring parallelism of a disc brake rotor, A technician measures 0.002" variation beyond
the specification. The next step is to? - ANSWER✔✔-Determine the minimum rotor machine to
thickness
Tech A says that disconnecting the negative battery cable may be required to disable the air bag
system. Tech B says that a self powered test light can be used to test air bag system components.
Who is correct? - ANSWER✔✔-Tech A only
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 1
, A vehicles battery prematurely fails. A charging system output test shows the alternator is producing
a constant 16.0 volts. This could indicate a failed... - ANSWER✔✔-Voltage regulator
A dirty cabin air filter can cause... - ANSWER✔✔-A musty smelling cabin
Define the term stroke - ANSWER✔✔-Distance the piston travels from TDC (top dead center) to
BDC (bottom dead center)
A vehicle is being checked for power steering leaks Technician A says that leaks can develop in the
fitting hoses and seals, Technician B says that the steering components should be observed for leaks
while a helper turns the steering wheel from side to side. Who is right? - ANSWER✔✔-Both
Brake fluid must meet minimum standards set by... - ANSWER✔✔-Department of traffic (DOT)
A flexible rubber brake line is being inspected.
Technician A says small blisters in the rubber are acceptable if they are not leaking.
Technician B says that small cracks in the rubber require replacement of the hose.
Who is correct? - ANSWER✔✔-Technician B only
A technician is preforming a service on a vehicle there is a risk of splashing liquid. Technician A says
that regular safety glasses with side shields will work. Tech B says that goggles combined with a face
shield will provide adequate protection. Who is correct? - ANSWER✔✔-Tech B
A band type TPMS (tire pressure monitor system) is being installed in the center of the rim. How
many degrees form the valve stem should the sensor be mounted? - ANSWER✔✔-180 (sensor and
valve stem should be parallel with each other)
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 2
