ASE G1 Test Questions with Correct Answers Latest Update 2025-2026
A tight timing belt makes what type of noise? - Answers Whining
A RWD (rear wheel drive) transmission has a leaking output shaft seal on a vehicle with 25,000 miles on
the odometer. The MOST likely cause for the leakage is: - Answers Plugged Transmission Breather filter
Of the following, when replacing a CV (constant velocity) joint or boot, what is the last step before
clamping the boot? - Answers Burping
Steering dampers can be used to reduce excessive __________. - Answers positive caster
A technician is rotating the tires using the modified X-method of tire rotation on a front-wheel-drive
vehicle. Where should be the right front wheel placed? - Answers Right Rear
The open circuit voltage (OCV) test on a fully charged battery should show which voltage? - Answers
12.6
There is white exhaust smoke coming from the tailpipe of a vehicle well after the engine has been
started. What is causing this condition? - Answers Coolant in combustion chamber
A front wheel drive vehicle has a clacking noise that only occurs while cornering. The technician suspects
a faulty front axle. Which of these is most likely the cause? - Answers Outer CV Joint
The tread of a tire is worn in the center and not on the outer shoulders. Technician A says this is caused
by an improper wheel alignment angle. Technician B says this is caused by an over-inflated tire. Who is
correct? (Just the letter) - Answers B
A vehicle with power assist brakes has a hard brake pedal. Which of these is the most likely cause? -
Answers A Faulty Brake Booster
Technician A says that oil should be squirted into all of the cylinders before taking a compression test.
Technician B says that if the compression greatly increases when some oil is squirted into the cylinders,
it indicates defective or worn piston rings. Which technician is correct? (Letter only) - Answers B
During a cylinder leakage (leak-down) test, air is noticed coming out of the oil fill opening. Technician A
says that the oil filter may be clogged. Technician B says that the piston rings may be worn or defective.
Which technician is correct? (Letter only) - Answers B
What precautions are needed to be performed to help prevent air from getting trapped in the cooling
system when replacing coolant? - Answers Open the Bleeder Valve during filling
To flush a hydraulic clutch system, what should be used? - Answers DOT 3
The engine of a vehicle will start, but is slow cranking. Technician A says there may be resistance in the
starter circuit. Technician B says to perform a voltage drop test to test for excessive resistance in the
starter circuit. Who is correct? ("A" "B" or "Both") - Answers Both
,Technician A says a stuck open PCV valve will cause a lean fuel condition. Technician B says the PCV
system removes blowby gases from the crankcase. Who is correct? ("A" "B" or "Both") - Answers Both
A technician removes and replaces a worn lower radiator hose on a four cylinder engine. The vehicle
overheats after the technician has replaced the hose and added coolant. Which of these is most likely
the cause of this condition? - Answers Air Pocket
Engine mounts were recently replaced on a front wheel drive vehicle with independent suspension. The
vehicle now has a steady pull to the left at all speeds. Technician A says this is most likely caused by
loose motor mounts. Technician B says this is most likely caused by a misaligned engine cradle. Who is
correct? ("A" "B" or "Both") - Answers B
A vehicle's right front wheel has a growling noise that increases with vehicle speed. The most likely
cause is: - Answers Worn out wheel bearing
A vehicle pulls to the left only while braking. Technician A says this could be a restricted left front brake
line. Technician B says this could be a frozen right front caliper. Who is correct? ("A" "B" or "Both") -
Answers B
A vehicle's air conditioner blows cold air while driving at normal speeds, but warm while sitting at stop
lights. The least-likely cause of this condition is: - Answers Frozen expansion valve
A vehicle blows blue/gray smoke from the tailpipe only when first started in the morning. The most
likely cause of this condition is: - Answers Leaking valve seal
The headlights get brighter as the engine is revved and RPM's increase. Technician A says this is caused
by a high capacity battery. Technician B says this is caused by a faulty voltage regulator. Who is correct?
("A" "B" or "Both") - Answers B
A technician is unable to balance a tire on a vehicle that vibrates at speeds above 35 mph. Technician A
says to continue adding weights around the rim up to 20 ounces. Technician B says to dismount the tire
from the rim and inspect the inside for liquid or debris. Who is correct? ("A" "B" or "Both") - Answers B
While performing an oil change the technician notices a red colored fluid leaking between the
transmission and the engine. Technician A says this is caused by a leaking rear main seal. Technician B
says this is caused by a leaking transmission pump seal. ("A" "B" or "Both") - Answers B
All the lights in a brake light circuit illuminate except one. The most likely cause is: - Answers Bulb
A rear wheel drive vehicle has a loud clunk when the transmission is placed into gear and a vibration
that increases with vehicle speed. Technician A says this is caused by loose universal joints. Technician B
says this is caused by an unbalanced driveshaft. Who is correct? ("A" "B" or "Both") - Answers A
Two technicians are discussing a ballooned oil filter. What is the most likely cause of this condition: -
Answers Closed oil pressure relief valve
, A technician measures several spots around a brake rotor with an outside micrometer. Technician A says
the technician is checking the rotor for thickness variation. Technician B says the technician is checking
the rotor for lateral runout. Who is correct? ("A" "B" or "Both") - Answers A
A faulty thermostat is being replaced. Technician A says a stuck open thermostat will affect engine
performance. Technician B says the thermostat controls the engine's operating temperature. Who is
correct? ("A" "B" or "Both") - Answers Both
A halogen bulb is being replaced in a headlight system. Technician A says to handle the bulb at it's base
during installation. Technician B says to wear gloves or use a piece of paper when handling the glass
portion of these bulbs. Who is correct? ("A" "B" or "Both") - Answers Both
The serpentine accessory drive belt of an engine squeaks but appears to be in good condition.
Technician A says this could be caused by a faulty idler bearing. Technician B says to check the belt with
a belt gauge. ("A" "B" or "Both") - Answers Both
Coolant should be tested for_____
a. Proper color
b. Freezing point (temperature)
c. Specific gravity
d. Both b and c - Answers D- Both B and c
Two technicians are discussing a compression test. Technician A says that the engine should be cranked
over with the pressure gauge installed for "4 puffs." Technician B says that the maximum difference
between the highest-reading cylinder and the lowest-reading cylinder should be 20%. Which technician
is correct?
a. Technician A only
b. Technician B only
c. Both Technicians A and B
d. Neither Technician A nor B - Answers C- Both Technician A and B
Technician A says that oil should be squirted into all of the cylinders before taking a compression test.
Technician B says that if the compression greatly increases when some oil is squirted into the cylinders,
it indicates defective or worn piston rings. Which technician is correct?
a. Technician A only
b. Technician B only
c. Both Technicians A and B
A tight timing belt makes what type of noise? - Answers Whining
A RWD (rear wheel drive) transmission has a leaking output shaft seal on a vehicle with 25,000 miles on
the odometer. The MOST likely cause for the leakage is: - Answers Plugged Transmission Breather filter
Of the following, when replacing a CV (constant velocity) joint or boot, what is the last step before
clamping the boot? - Answers Burping
Steering dampers can be used to reduce excessive __________. - Answers positive caster
A technician is rotating the tires using the modified X-method of tire rotation on a front-wheel-drive
vehicle. Where should be the right front wheel placed? - Answers Right Rear
The open circuit voltage (OCV) test on a fully charged battery should show which voltage? - Answers
12.6
There is white exhaust smoke coming from the tailpipe of a vehicle well after the engine has been
started. What is causing this condition? - Answers Coolant in combustion chamber
A front wheel drive vehicle has a clacking noise that only occurs while cornering. The technician suspects
a faulty front axle. Which of these is most likely the cause? - Answers Outer CV Joint
The tread of a tire is worn in the center and not on the outer shoulders. Technician A says this is caused
by an improper wheel alignment angle. Technician B says this is caused by an over-inflated tire. Who is
correct? (Just the letter) - Answers B
A vehicle with power assist brakes has a hard brake pedal. Which of these is the most likely cause? -
Answers A Faulty Brake Booster
Technician A says that oil should be squirted into all of the cylinders before taking a compression test.
Technician B says that if the compression greatly increases when some oil is squirted into the cylinders,
it indicates defective or worn piston rings. Which technician is correct? (Letter only) - Answers B
During a cylinder leakage (leak-down) test, air is noticed coming out of the oil fill opening. Technician A
says that the oil filter may be clogged. Technician B says that the piston rings may be worn or defective.
Which technician is correct? (Letter only) - Answers B
What precautions are needed to be performed to help prevent air from getting trapped in the cooling
system when replacing coolant? - Answers Open the Bleeder Valve during filling
To flush a hydraulic clutch system, what should be used? - Answers DOT 3
The engine of a vehicle will start, but is slow cranking. Technician A says there may be resistance in the
starter circuit. Technician B says to perform a voltage drop test to test for excessive resistance in the
starter circuit. Who is correct? ("A" "B" or "Both") - Answers Both
,Technician A says a stuck open PCV valve will cause a lean fuel condition. Technician B says the PCV
system removes blowby gases from the crankcase. Who is correct? ("A" "B" or "Both") - Answers Both
A technician removes and replaces a worn lower radiator hose on a four cylinder engine. The vehicle
overheats after the technician has replaced the hose and added coolant. Which of these is most likely
the cause of this condition? - Answers Air Pocket
Engine mounts were recently replaced on a front wheel drive vehicle with independent suspension. The
vehicle now has a steady pull to the left at all speeds. Technician A says this is most likely caused by
loose motor mounts. Technician B says this is most likely caused by a misaligned engine cradle. Who is
correct? ("A" "B" or "Both") - Answers B
A vehicle's right front wheel has a growling noise that increases with vehicle speed. The most likely
cause is: - Answers Worn out wheel bearing
A vehicle pulls to the left only while braking. Technician A says this could be a restricted left front brake
line. Technician B says this could be a frozen right front caliper. Who is correct? ("A" "B" or "Both") -
Answers B
A vehicle's air conditioner blows cold air while driving at normal speeds, but warm while sitting at stop
lights. The least-likely cause of this condition is: - Answers Frozen expansion valve
A vehicle blows blue/gray smoke from the tailpipe only when first started in the morning. The most
likely cause of this condition is: - Answers Leaking valve seal
The headlights get brighter as the engine is revved and RPM's increase. Technician A says this is caused
by a high capacity battery. Technician B says this is caused by a faulty voltage regulator. Who is correct?
("A" "B" or "Both") - Answers B
A technician is unable to balance a tire on a vehicle that vibrates at speeds above 35 mph. Technician A
says to continue adding weights around the rim up to 20 ounces. Technician B says to dismount the tire
from the rim and inspect the inside for liquid or debris. Who is correct? ("A" "B" or "Both") - Answers B
While performing an oil change the technician notices a red colored fluid leaking between the
transmission and the engine. Technician A says this is caused by a leaking rear main seal. Technician B
says this is caused by a leaking transmission pump seal. ("A" "B" or "Both") - Answers B
All the lights in a brake light circuit illuminate except one. The most likely cause is: - Answers Bulb
A rear wheel drive vehicle has a loud clunk when the transmission is placed into gear and a vibration
that increases with vehicle speed. Technician A says this is caused by loose universal joints. Technician B
says this is caused by an unbalanced driveshaft. Who is correct? ("A" "B" or "Both") - Answers A
Two technicians are discussing a ballooned oil filter. What is the most likely cause of this condition: -
Answers Closed oil pressure relief valve
, A technician measures several spots around a brake rotor with an outside micrometer. Technician A says
the technician is checking the rotor for thickness variation. Technician B says the technician is checking
the rotor for lateral runout. Who is correct? ("A" "B" or "Both") - Answers A
A faulty thermostat is being replaced. Technician A says a stuck open thermostat will affect engine
performance. Technician B says the thermostat controls the engine's operating temperature. Who is
correct? ("A" "B" or "Both") - Answers Both
A halogen bulb is being replaced in a headlight system. Technician A says to handle the bulb at it's base
during installation. Technician B says to wear gloves or use a piece of paper when handling the glass
portion of these bulbs. Who is correct? ("A" "B" or "Both") - Answers Both
The serpentine accessory drive belt of an engine squeaks but appears to be in good condition.
Technician A says this could be caused by a faulty idler bearing. Technician B says to check the belt with
a belt gauge. ("A" "B" or "Both") - Answers Both
Coolant should be tested for_____
a. Proper color
b. Freezing point (temperature)
c. Specific gravity
d. Both b and c - Answers D- Both B and c
Two technicians are discussing a compression test. Technician A says that the engine should be cranked
over with the pressure gauge installed for "4 puffs." Technician B says that the maximum difference
between the highest-reading cylinder and the lowest-reading cylinder should be 20%. Which technician
is correct?
a. Technician A only
b. Technician B only
c. Both Technicians A and B
d. Neither Technician A nor B - Answers C- Both Technician A and B
Technician A says that oil should be squirted into all of the cylinders before taking a compression test.
Technician B says that if the compression greatly increases when some oil is squirted into the cylinders,
it indicates defective or worn piston rings. Which technician is correct?
a. Technician A only
b. Technician B only
c. Both Technicians A and B
