Maryland Automotive Master
Technician Exam Practice Questions And
Correct Answers (Verified Answers) Plus
Rationale 2026 Q&A| Instant Download
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1. A technician is diagnosing an engine misfire on a late-model vehicle
equipped with coil-on-plug ignition. The scan tool indicates a P0304
diagnostic trouble code. Which cylinder is identified as misfiring?
A. Cylinder 1
B. Cylinder 2
C. Cylinder 3
D. Cylinder 4
Rationale: OBD-II trouble code P0304 specifically identifies a misfire
occurring in cylinder number 4. Technicians must understand generic
powertrain code structures for accurate diagnostics.
2. A customer complains that the steering wheel vibrates only during
braking at highway speeds. Which condition is the MOST likely cause?
A. Worn tie rod ends
B. Improper wheel alignment
,C. Warped brake rotors
D. Low tire pressure
Rationale: Brake rotor lateral runout or thickness variation commonly
causes steering wheel vibration during braking. This symptom is especially
noticeable at higher speeds.
3. A technician measures battery voltage with the engine off and obtains
a reading of 12.6 volts. What does this indicate?
A. Battery is discharged
B. Alternator is defective
C. Starter is drawing excessive current
D. Battery is fully charged
Rationale: A healthy fully charged 12-volt automotive battery typically
measures approximately 12.6 volts at rest. Lower readings indicate partial
discharge or battery deterioration.
4. What is the primary purpose of the catalytic converter?
A. Reduce fuel consumption
B. Increase engine compression
C. Reduce harmful exhaust emissions
D. Improve oil circulation
Rationale: Catalytic converters reduce harmful emissions such as
hydrocarbons, carbon monoxide, and nitrogen oxides by promoting
chemical reactions in the exhaust stream.
5. A vehicle pulls to the right during braking. Which condition is MOST
likely responsible?
A. Low transmission fluid
B. Broken sway bar link
,C. Sticking left front brake caliper
D. Defective oxygen sensor
Rationale: A sticking caliper on the opposite side reduces braking force
there, causing the vehicle to pull toward the side with greater braking
force.
6. What is the function of engine oil viscosity?
A. Determine ignition timing
B. Measure fuel octane
C. Indicate resistance to flow
D. Control exhaust emissions
Rationale: Oil viscosity refers to the oil’s resistance to flow at various
temperatures. Correct viscosity is critical for proper lubrication and engine
protection.
7. A technician finds excessive play in the steering wheel before the
wheels respond. Which component is MOST likely worn?
A. Fuel injector
B. Crankshaft sensor
C. Steering gearbox or linkage
D. Evaporator core
Rationale: Excessive steering wheel free play usually indicates wear in
steering linkage components or the steering gearbox.
8. Which sensor primarily measures oxygen content in the exhaust
stream?
A. MAP sensor
B. TPS sensor
C. MAF sensor
D. Oxygen sensor
, Rationale: Oxygen sensors monitor oxygen levels in exhaust gases to help
the PCM adjust air-fuel mixture for efficient combustion and emissions
control.
9. A technician observes uneven tire wear on both front tires along the
inner edges. What is the MOST likely cause?
A. Underinflation
B. Worn shocks
C. Excessive negative camber
D. Weak battery
Rationale: Excessive negative camber causes the inner tire edges to contact
the road more heavily, leading to accelerated wear.
10. What is the purpose of the thermostat in the cooling system?
A. Increase fuel pressure
B. Control transmission shifts
C. Regulate engine operating temperature
D. Lubricate water pump bearings
Rationale: The thermostat regulates coolant flow to maintain proper
engine operating temperature, improving efficiency and reducing wear.
11. A vehicle’s battery repeatedly goes dead overnight. Which test
would BEST identify excessive current draw with the ignition off?
A. Compression test
B. Fuel pressure test
C. Vacuum test
D. Parasitic draw test
Rationale: A parasitic draw test measures electrical current consumption
with the ignition off to locate unwanted battery drain.
Technician Exam Practice Questions And
Correct Answers (Verified Answers) Plus
Rationale 2026 Q&A| Instant Download
1. A technician is diagnosing an engine misfire on a late-model vehicle
equipped with coil-on-plug ignition. The scan tool indicates a P0304
diagnostic trouble code. Which cylinder is identified as misfiring?
A. Cylinder 1
B. Cylinder 2
C. Cylinder 3
D. Cylinder 4
Rationale: OBD-II trouble code P0304 specifically identifies a misfire
occurring in cylinder number 4. Technicians must understand generic
powertrain code structures for accurate diagnostics.
2. A customer complains that the steering wheel vibrates only during
braking at highway speeds. Which condition is the MOST likely cause?
A. Worn tie rod ends
B. Improper wheel alignment
,C. Warped brake rotors
D. Low tire pressure
Rationale: Brake rotor lateral runout or thickness variation commonly
causes steering wheel vibration during braking. This symptom is especially
noticeable at higher speeds.
3. A technician measures battery voltage with the engine off and obtains
a reading of 12.6 volts. What does this indicate?
A. Battery is discharged
B. Alternator is defective
C. Starter is drawing excessive current
D. Battery is fully charged
Rationale: A healthy fully charged 12-volt automotive battery typically
measures approximately 12.6 volts at rest. Lower readings indicate partial
discharge or battery deterioration.
4. What is the primary purpose of the catalytic converter?
A. Reduce fuel consumption
B. Increase engine compression
C. Reduce harmful exhaust emissions
D. Improve oil circulation
Rationale: Catalytic converters reduce harmful emissions such as
hydrocarbons, carbon monoxide, and nitrogen oxides by promoting
chemical reactions in the exhaust stream.
5. A vehicle pulls to the right during braking. Which condition is MOST
likely responsible?
A. Low transmission fluid
B. Broken sway bar link
,C. Sticking left front brake caliper
D. Defective oxygen sensor
Rationale: A sticking caliper on the opposite side reduces braking force
there, causing the vehicle to pull toward the side with greater braking
force.
6. What is the function of engine oil viscosity?
A. Determine ignition timing
B. Measure fuel octane
C. Indicate resistance to flow
D. Control exhaust emissions
Rationale: Oil viscosity refers to the oil’s resistance to flow at various
temperatures. Correct viscosity is critical for proper lubrication and engine
protection.
7. A technician finds excessive play in the steering wheel before the
wheels respond. Which component is MOST likely worn?
A. Fuel injector
B. Crankshaft sensor
C. Steering gearbox or linkage
D. Evaporator core
Rationale: Excessive steering wheel free play usually indicates wear in
steering linkage components or the steering gearbox.
8. Which sensor primarily measures oxygen content in the exhaust
stream?
A. MAP sensor
B. TPS sensor
C. MAF sensor
D. Oxygen sensor
, Rationale: Oxygen sensors monitor oxygen levels in exhaust gases to help
the PCM adjust air-fuel mixture for efficient combustion and emissions
control.
9. A technician observes uneven tire wear on both front tires along the
inner edges. What is the MOST likely cause?
A. Underinflation
B. Worn shocks
C. Excessive negative camber
D. Weak battery
Rationale: Excessive negative camber causes the inner tire edges to contact
the road more heavily, leading to accelerated wear.
10. What is the purpose of the thermostat in the cooling system?
A. Increase fuel pressure
B. Control transmission shifts
C. Regulate engine operating temperature
D. Lubricate water pump bearings
Rationale: The thermostat regulates coolant flow to maintain proper
engine operating temperature, improving efficiency and reducing wear.
11. A vehicle’s battery repeatedly goes dead overnight. Which test
would BEST identify excessive current draw with the ignition off?
A. Compression test
B. Fuel pressure test
C. Vacuum test
D. Parasitic draw test
Rationale: A parasitic draw test measures electrical current consumption
with the ignition off to locate unwanted battery drain.
