Smog Inspector BAR Exam Practice Complete Study Guide
2026 | Exam Q&A | Latest Update | Graded A+
1. What should a technician do if the under-hood BAR referee emissions label
indicates an ECS that is missing from the vehicle?
Contact the vehicle owner for clarification.
Replace the missing ECS immediately.
Ignore the label and proceed with the inspection.
Follow the appropriate procedures for handling discrepancies
during inspections.
2. If a vehicle's EGR system is malfunctioning, what impact might this have on the
vehicle's emissions during a smog inspection?
Decreased carbon monoxide emissions
Increased nitrogen oxide emissions
Improved fuel efficiency
Lower hydrocarbon emissions
3. During the Visual Inspection, the technician notices that the vehicle has a
non-OEM aftermarket carburetor installed. What is the correct procedure to
inspect this vehicle?
Check to see if the carburetor is approved as a street-legal
replacement part
Send the vehicle to the State Referee
Call the local BAR Field Office for assistance
Fail the vehicle as 'Modified'
,4. What is the requirement for inspectors regarding disassembly of vehicles
during smog inspections?
Inspectors must conduct a pressure test for liquid fuel leaks.
Inspectors are required to perform a full inspection of the vehicle's
engine.
Inspectors must disassemble the vehicle to check for liquid fuel leaks.
Inspectors are not required to perform disassembly of the vehicle
to inspect for liquid fuel leaks.
5. Interpret what a dilution error means for the accuracy of emissions testing.
A dilution error shows that the fuel mixture is optimal for combustion.
A dilution error indicates that the vehicle is running efficiently with low
emissions.
A dilution error suggests that the exhaust sample may be
contaminated with excess air, leading to inaccurate emissions
readings.
A dilution error means the emissions system is functioning properly.
6. If a smog check technician finds that the OBD II functional test indicates a
malfunctioning emissions system, what should be the next step in the
inspection process?
Perform necessary repairs and re-test the emissions system
Issue a temporary waiver without further action
Ignore the results and proceed with the inspection
Pass the vehicle without further testing
, 7. The OBD II function test, automatically performed by the EIS, assesses the
system's ability to:
Communicate
Determine readiness of system monitors
Read DTC
All of the above
8. What should a technician do if a customer does not provide registration
paperwork during an OIS inspection?
Proceed with the inspection using the vehicle's VIN.
Inform the customer that the inspection cannot proceed without the
registration paperwork.
Conduct a preliminary inspection without the paperwork.
Schedule the inspection for a later date.
9. During a smog check, if a technician discovers a discrepancy between the
emissions label and the actual equipment present, what steps should they
take to ensure compliance with regulations?
Document the discrepancy and follow the established procedures
for addressing such issues.
Replace the emissions equipment on the spot.
Proceed with the inspection without addressing the discrepancy.
Notify the vehicle owner to take the vehicle to a different inspection
station.
2026 | Exam Q&A | Latest Update | Graded A+
1. What should a technician do if the under-hood BAR referee emissions label
indicates an ECS that is missing from the vehicle?
Contact the vehicle owner for clarification.
Replace the missing ECS immediately.
Ignore the label and proceed with the inspection.
Follow the appropriate procedures for handling discrepancies
during inspections.
2. If a vehicle's EGR system is malfunctioning, what impact might this have on the
vehicle's emissions during a smog inspection?
Decreased carbon monoxide emissions
Increased nitrogen oxide emissions
Improved fuel efficiency
Lower hydrocarbon emissions
3. During the Visual Inspection, the technician notices that the vehicle has a
non-OEM aftermarket carburetor installed. What is the correct procedure to
inspect this vehicle?
Check to see if the carburetor is approved as a street-legal
replacement part
Send the vehicle to the State Referee
Call the local BAR Field Office for assistance
Fail the vehicle as 'Modified'
,4. What is the requirement for inspectors regarding disassembly of vehicles
during smog inspections?
Inspectors must conduct a pressure test for liquid fuel leaks.
Inspectors are required to perform a full inspection of the vehicle's
engine.
Inspectors must disassemble the vehicle to check for liquid fuel leaks.
Inspectors are not required to perform disassembly of the vehicle
to inspect for liquid fuel leaks.
5. Interpret what a dilution error means for the accuracy of emissions testing.
A dilution error shows that the fuel mixture is optimal for combustion.
A dilution error indicates that the vehicle is running efficiently with low
emissions.
A dilution error suggests that the exhaust sample may be
contaminated with excess air, leading to inaccurate emissions
readings.
A dilution error means the emissions system is functioning properly.
6. If a smog check technician finds that the OBD II functional test indicates a
malfunctioning emissions system, what should be the next step in the
inspection process?
Perform necessary repairs and re-test the emissions system
Issue a temporary waiver without further action
Ignore the results and proceed with the inspection
Pass the vehicle without further testing
, 7. The OBD II function test, automatically performed by the EIS, assesses the
system's ability to:
Communicate
Determine readiness of system monitors
Read DTC
All of the above
8. What should a technician do if a customer does not provide registration
paperwork during an OIS inspection?
Proceed with the inspection using the vehicle's VIN.
Inform the customer that the inspection cannot proceed without the
registration paperwork.
Conduct a preliminary inspection without the paperwork.
Schedule the inspection for a later date.
9. During a smog check, if a technician discovers a discrepancy between the
emissions label and the actual equipment present, what steps should they
take to ensure compliance with regulations?
Document the discrepancy and follow the established procedures
for addressing such issues.
Replace the emissions equipment on the spot.
Proceed with the inspection without addressing the discrepancy.
Notify the vehicle owner to take the vehicle to a different inspection
station.
