SMOG Level 1 Practice Test – English Language Proficiency Exam
Questions and Answers
Description:
100 Multiple-Choice Questions with Detailed Explanations
SECTION 1: INSPECTION PROCEDURES (25 Questions)
Question 1: ASM Testing Procedures
During an ASM (Acceleration Simulation Mode) test, the vehicle's engine must be maintained at
approximately what RPM range for the 25 mph test mode?
A) 1,000-1,500 RPM B) 1,800-2,400 RPM C) 2,500-3,500 RPM D) 4,000-5,000 RPM
Correct Answer: B
Explanation: The correct answer is B because the ASM 25 mph test requires maintaining engine speed
between 1,800-2,400 RPM to properly simulate acceleration conditions while measuring emissions
under load.
A is incorrect because 1,000-1,500 RPM is too low and would not generate sufficient load or exhaust
flow for accurate measurement. C is incorrect because 2,500-3,500 RPM exceeds the target range for
the 25 mph mode (this range is closer to the 50 mph mode requirements). D is incorrect because 4,000-
5,000 RPM is dangerously high and would violate testing protocols, potentially damaging the engine or
creating unsafe conditions.
Question 2: Visual Inspection Protocols
During the visual inspection of a 2010 gasoline vehicle, you notice the fuel filler neck has been replaced
with a non-OEM part that lacks an EO (Executive Order) number. What is your required action?
A) Pass the vehicle if the part appears functional B) Fail the vehicle and require OEM replacement only
C) Fail the vehicle and direct the owner to obtain an EO-stamped replacement or BAR referee evaluation
D) Pass the vehicle if the owner provides a receipt
Correct Answer: C
Explanation: The correct answer is C because California BAR regulations require all aftermarket
emissions-related parts to display a valid EO number. If an aftermarket part lacks this marking, the
vehicle fails visual inspection. The owner must either obtain a properly EO-certified replacement or seek
a BAR referee determination if they believe the part is equivalent.
,A is incorrect because functionality alone does not satisfy regulatory requirements for emissions
components. B is incorrect because OEM replacement is not strictly required—an aftermarket part with
a valid EO number is acceptable. D is incorrect because purchase receipts do not substitute for EO
certification markings on the part itself.
Question 3: OBD II Functional Testing
When performing an OBD II inspection, the "Readiness Status" shows two monitors as "Not Ready." The
vehicle is a 2001 model year. What is the correct procedure?
A) Reject the vehicle and require driving cycle completion B) Proceed with the inspection if at least 5 of 7
monitors are ready C) Proceed with the inspection regardless of readiness status D) Fail the vehicle
immediately for tampering
Correct Answer: B
Explanation: The correct answer is B because for 1996-2000 model year vehicles, BAR requires all
applicable monitors to be ready. However, for 2001 and newer model years, up to two monitors may be
not ready and the vehicle can still pass the OBD II portion (with the exception that the catalyst monitor
must always be ready).
A is incorrect because rejection is only required for 1996-2000 vehicles with any non-ready monitors. C
is incorrect because there are limits to allowable non-ready monitors even for newer vehicles. D is
incorrect because not-ready monitors do not indicate tampering—they simply indicate incomplete drive
cycles.
Question 4: EGR System Testing
During functional testing of an EGR system on a 1995 vehicle equipped with a vacuum-controlled EGR
valve, you apply vacuum to the valve diaphragm. The engine should:
A) Stall immediately regardless of engine temperature B) Show no change in engine operation C)
Stumble or stall if the engine is at operating temperature D) Increase RPM by 200-300
Correct Answer: C
Explanation: The correct answer is C because applying vacuum to a properly functioning EGR valve at
operating temperature causes exhaust gas recirculation, which displaces oxygen in the combustion
chamber and causes the engine to stumble or stall. This confirms the valve opens and the passages are
clear.
A is incorrect because immediate stalling regardless of temperature suggests a stuck-open valve or
severely restricted EGR passages. B is incorrect because no change indicates a faulty valve, blocked
passages, or insufficient vacuum. D is incorrect because EGR introduction reduces combustion efficiency
and should never increase RPM.
,Question 5: Gas Cap Testing
When testing a gas cap using the pressure decay method, the cap must hold pressure for how long to
pass?
A) 5 seconds B) 10 seconds C) 30 seconds D) 60 seconds
Correct Answer: B
Explanation: The correct answer is B because BAR regulations specify that gas caps must maintain
pressure for a minimum of 10 seconds during the pressure decay test. The cap is pressurized to
approximately 28-30 inches of water column and must not drop below 22 inches within the 10-second
test period.
A is incorrect because 5 seconds is insufficient to detect small leaks that would fail the vehicle. C is
incorrect because while some equipment may test longer, the regulatory minimum is 10 seconds. D is
incorrect because 60 seconds exceeds standard test protocols and would unnecessarily delay
inspections.
Question 6: Vehicle Preparation
Before conducting an ASM emissions test, the vehicle must be driven to achieve what minimum
condition?
A) Engine oil temperature above 200°F B) Engine at normal operating temperature C) Transmission fluid
changed within 1,000 miles D) Fuel tank between 1/4 and 3/4 full
Correct Answer: B
Explanation: The correct answer is B because BAR regulations require the engine to be at normal
operating temperature (typically indicated by the coolant temperature gauge reaching its normal
position) before ASM testing. This ensures the engine management system is in closed-loop operation
and emissions controls are fully active.
A is incorrect because oil temperature is not the specified metric—coolant temperature is the standard
indicator. C is incorrect because transmission fluid condition is irrelevant to emissions testing
requirements. D is incorrect because while fuel level affects EVAP testing, it is not a prerequisite for ASM
testing.
Question 7: Ignition Timing Inspection
When checking ignition timing on a vehicle with a distributor, you find the timing is 5 degrees advanced
from the specification listed on the underhood label. What is the correct action?
A) Pass the vehicle if emissions are within limits B) Adjust timing to specification and retest C) Fail the
vehicle for timing tampering D) Document the variance and proceed
Correct Answer: B
, Explanation: The correct answer is B because BAR regulations require ignition timing to be set to
manufacturer specifications before emissions testing. If timing is incorrect, the inspector must adjust it
to specification and then proceed with the emissions test.
A is incorrect because passing a vehicle with incorrect timing violates inspection protocols regardless of
emissions results. C is incorrect because 5 degrees variance typically indicates misadjustment rather
than deliberate tampering. D is incorrect because documenting without correction does not satisfy the
requirement to set timing properly.
Question 8: Dynamometer Safety
During ASM testing, the vehicle's tires begin to smoke excessively on the dynamometer rollers. What is
your immediate action?
A) Continue the test to completion B) Abort the test and inspect tires for proper size and condition C)
Apply water to cool the tires D) Increase roller pressure to improve traction
Correct Answer: B
Explanation: The correct answer is B because smoking tires indicate excessive slippage, which can be
caused by incorrect tire size, improper inflation, worn tires, or roller pressure issues. Continuing the test
risks inaccurate results and potential equipment damage. The test must be aborted to identify and
correct the cause.
A is incorrect because continuing with slipping tires produces invalid test data and safety hazards. C is
incorrect because applying water to hot tires creates a steam hazard and can damage tires. D is
incorrect because increasing pressure without identifying the root cause may damage tires or the
dynamometer.
Question 9: EVAP System Visual Inspection
During visual inspection of the EVAP system on a 2005 vehicle, you observe the fuel tank pressure
sensor electrical connector is unplugged. What is the appropriate classification?
A) Pass with warning B) Tampering (defeat device) C) Missing component D) Modified component
Correct Answer: B
Explanation: The correct answer is B because an unplugged EVAP pressure sensor connector constitutes
a tampering violation (defeat device) under BAR regulations. The sensor is required for proper EVAP
system monitoring, and disconnecting it prevents the OBD II system from detecting leaks.
A is incorrect because any disconnected emissions-related electrical component results in a failure. C is
incorrect because the component is present but disabled. D is incorrect because the component has not
been modified—it has been intentionally disconnected.
Questions and Answers
Description:
100 Multiple-Choice Questions with Detailed Explanations
SECTION 1: INSPECTION PROCEDURES (25 Questions)
Question 1: ASM Testing Procedures
During an ASM (Acceleration Simulation Mode) test, the vehicle's engine must be maintained at
approximately what RPM range for the 25 mph test mode?
A) 1,000-1,500 RPM B) 1,800-2,400 RPM C) 2,500-3,500 RPM D) 4,000-5,000 RPM
Correct Answer: B
Explanation: The correct answer is B because the ASM 25 mph test requires maintaining engine speed
between 1,800-2,400 RPM to properly simulate acceleration conditions while measuring emissions
under load.
A is incorrect because 1,000-1,500 RPM is too low and would not generate sufficient load or exhaust
flow for accurate measurement. C is incorrect because 2,500-3,500 RPM exceeds the target range for
the 25 mph mode (this range is closer to the 50 mph mode requirements). D is incorrect because 4,000-
5,000 RPM is dangerously high and would violate testing protocols, potentially damaging the engine or
creating unsafe conditions.
Question 2: Visual Inspection Protocols
During the visual inspection of a 2010 gasoline vehicle, you notice the fuel filler neck has been replaced
with a non-OEM part that lacks an EO (Executive Order) number. What is your required action?
A) Pass the vehicle if the part appears functional B) Fail the vehicle and require OEM replacement only
C) Fail the vehicle and direct the owner to obtain an EO-stamped replacement or BAR referee evaluation
D) Pass the vehicle if the owner provides a receipt
Correct Answer: C
Explanation: The correct answer is C because California BAR regulations require all aftermarket
emissions-related parts to display a valid EO number. If an aftermarket part lacks this marking, the
vehicle fails visual inspection. The owner must either obtain a properly EO-certified replacement or seek
a BAR referee determination if they believe the part is equivalent.
,A is incorrect because functionality alone does not satisfy regulatory requirements for emissions
components. B is incorrect because OEM replacement is not strictly required—an aftermarket part with
a valid EO number is acceptable. D is incorrect because purchase receipts do not substitute for EO
certification markings on the part itself.
Question 3: OBD II Functional Testing
When performing an OBD II inspection, the "Readiness Status" shows two monitors as "Not Ready." The
vehicle is a 2001 model year. What is the correct procedure?
A) Reject the vehicle and require driving cycle completion B) Proceed with the inspection if at least 5 of 7
monitors are ready C) Proceed with the inspection regardless of readiness status D) Fail the vehicle
immediately for tampering
Correct Answer: B
Explanation: The correct answer is B because for 1996-2000 model year vehicles, BAR requires all
applicable monitors to be ready. However, for 2001 and newer model years, up to two monitors may be
not ready and the vehicle can still pass the OBD II portion (with the exception that the catalyst monitor
must always be ready).
A is incorrect because rejection is only required for 1996-2000 vehicles with any non-ready monitors. C
is incorrect because there are limits to allowable non-ready monitors even for newer vehicles. D is
incorrect because not-ready monitors do not indicate tampering—they simply indicate incomplete drive
cycles.
Question 4: EGR System Testing
During functional testing of an EGR system on a 1995 vehicle equipped with a vacuum-controlled EGR
valve, you apply vacuum to the valve diaphragm. The engine should:
A) Stall immediately regardless of engine temperature B) Show no change in engine operation C)
Stumble or stall if the engine is at operating temperature D) Increase RPM by 200-300
Correct Answer: C
Explanation: The correct answer is C because applying vacuum to a properly functioning EGR valve at
operating temperature causes exhaust gas recirculation, which displaces oxygen in the combustion
chamber and causes the engine to stumble or stall. This confirms the valve opens and the passages are
clear.
A is incorrect because immediate stalling regardless of temperature suggests a stuck-open valve or
severely restricted EGR passages. B is incorrect because no change indicates a faulty valve, blocked
passages, or insufficient vacuum. D is incorrect because EGR introduction reduces combustion efficiency
and should never increase RPM.
,Question 5: Gas Cap Testing
When testing a gas cap using the pressure decay method, the cap must hold pressure for how long to
pass?
A) 5 seconds B) 10 seconds C) 30 seconds D) 60 seconds
Correct Answer: B
Explanation: The correct answer is B because BAR regulations specify that gas caps must maintain
pressure for a minimum of 10 seconds during the pressure decay test. The cap is pressurized to
approximately 28-30 inches of water column and must not drop below 22 inches within the 10-second
test period.
A is incorrect because 5 seconds is insufficient to detect small leaks that would fail the vehicle. C is
incorrect because while some equipment may test longer, the regulatory minimum is 10 seconds. D is
incorrect because 60 seconds exceeds standard test protocols and would unnecessarily delay
inspections.
Question 6: Vehicle Preparation
Before conducting an ASM emissions test, the vehicle must be driven to achieve what minimum
condition?
A) Engine oil temperature above 200°F B) Engine at normal operating temperature C) Transmission fluid
changed within 1,000 miles D) Fuel tank between 1/4 and 3/4 full
Correct Answer: B
Explanation: The correct answer is B because BAR regulations require the engine to be at normal
operating temperature (typically indicated by the coolant temperature gauge reaching its normal
position) before ASM testing. This ensures the engine management system is in closed-loop operation
and emissions controls are fully active.
A is incorrect because oil temperature is not the specified metric—coolant temperature is the standard
indicator. C is incorrect because transmission fluid condition is irrelevant to emissions testing
requirements. D is incorrect because while fuel level affects EVAP testing, it is not a prerequisite for ASM
testing.
Question 7: Ignition Timing Inspection
When checking ignition timing on a vehicle with a distributor, you find the timing is 5 degrees advanced
from the specification listed on the underhood label. What is the correct action?
A) Pass the vehicle if emissions are within limits B) Adjust timing to specification and retest C) Fail the
vehicle for timing tampering D) Document the variance and proceed
Correct Answer: B
, Explanation: The correct answer is B because BAR regulations require ignition timing to be set to
manufacturer specifications before emissions testing. If timing is incorrect, the inspector must adjust it
to specification and then proceed with the emissions test.
A is incorrect because passing a vehicle with incorrect timing violates inspection protocols regardless of
emissions results. C is incorrect because 5 degrees variance typically indicates misadjustment rather
than deliberate tampering. D is incorrect because documenting without correction does not satisfy the
requirement to set timing properly.
Question 8: Dynamometer Safety
During ASM testing, the vehicle's tires begin to smoke excessively on the dynamometer rollers. What is
your immediate action?
A) Continue the test to completion B) Abort the test and inspect tires for proper size and condition C)
Apply water to cool the tires D) Increase roller pressure to improve traction
Correct Answer: B
Explanation: The correct answer is B because smoking tires indicate excessive slippage, which can be
caused by incorrect tire size, improper inflation, worn tires, or roller pressure issues. Continuing the test
risks inaccurate results and potential equipment damage. The test must be aborted to identify and
correct the cause.
A is incorrect because continuing with slipping tires produces invalid test data and safety hazards. C is
incorrect because applying water to hot tires creates a steam hazard and can damage tires. D is
incorrect because increasing pressure without identifying the root cause may damage tires or the
dynamometer.
Question 9: EVAP System Visual Inspection
During visual inspection of the EVAP system on a 2005 vehicle, you observe the fuel tank pressure
sensor electrical connector is unplugged. What is the appropriate classification?
A) Pass with warning B) Tampering (defeat device) C) Missing component D) Modified component
Correct Answer: B
Explanation: The correct answer is B because an unplugged EVAP pressure sensor connector constitutes
a tampering violation (defeat device) under BAR regulations. The sensor is required for proper EVAP
system monitoring, and disconnecting it prevents the OBD II system from detecting leaks.
A is incorrect because any disconnected emissions-related electrical component results in a failure. C is
incorrect because the component is present but disabled. D is incorrect because the component has not
been modified—it has been intentionally disconnected.
