SMOG CHECK INSPECTOR
COMPREHENSIVE
STUDY GUIDE 2026 FULL
QUESTIONS
AND SOLUTIONS GRADED A+
● The EGR system works by recirculating a portion of an
engines exhaust back into the combustion chamber to reduce
peak combustion temperatures. Excessive combustion
temperature increases ____ which contributes to the formation
of photochemical smog and ground level ozone.. Answer:
NOX
● Which of the following is NOT considered a sub system of
the computerized emission control system ?. Answer: Antilock
brake module
● When calibrating the bar 97 which gases does it have ?.
Answer: Zero, high, and low
● Vehicles 95' and older are tested on which machine ?.
Answer: OBD 1
● A SPCNS vehicle may be built from ? (3 things ). Answer:
Kit cars, new or used parts, dismantled vehicles that are
reconstructed but do not resemble the original make
,● What is the difference between a three wire oxygen sensor
and a single wire oxygen sensor ?. Answer: A three wire allows
earlier closed loop operation
● Do not inspect kit cars unless they are equipped with ?.
Answer: Bar referee label
● Functional tests are procedures that consist of. Answer: EGR
systems, ignition timing, MIL, OBD, LPFET, fuel cap
(following manufacturer procedures, smog check manual and
as prompted by the inspection system
● On Bar 97 EIS selecting "G" or "government" will chase the
EIS to ask for what to input into the system ?. Answer: BAR
FILE # (thereby preventing a certificate of compliance from
being issues) N/A
● If a vehicle fails smog, and get the needed repairs done,
which station should they refer back to ?. Answer: Any STAR
certified station
● On government vehicles if the odometer is missing or
illegible enter ___?. Answer: None; N/A
● Why was OBD originally introduced on vehicles ?. Answer:
To lower emissions and help with vehicle repair
● If VIN and plate entries are correct and communication
failure continues what should the tech do? How do you
proceed?. Answer: Complete the inspection as promoted by the
EIS.
● Kit cars are a group of what type of vehicles ?. Answer:
SPCNS, grey market and vehicles with engine changes
, ● At what engine idle speed should the engine timing test be
performed ?. Answer: Engine idle must be within plus or minus
100 rpm of the manufacturers specifications
● If a vehicle is registered in the enhanced area but it garaged
in s basic area it must undergo ..?. Answer: An enhanced area
inspection
● Which of the following actions should be taken if a vehicles
timing reads 5 degrees BTDC and the specification of the
vehicle is 8 degrees ?. Answer: Enter "PASS" into the analyzer
for ignition timing and 5 degrees BTDC for the timing reading
● Which of the following is a primary purpose of the smog
check referee ?. Answer: Perform inspection dispute
resolutions
● Inspector A says that aftermarket air intake systems on 95
and older vehicles that do not alter or relocate emission control
components are not required to have a CARB EO #. Tech b
says that OBD II equipped are required to have a CARB EO #
for aftermarket air intake systems. Who is correct ?. Answer:
Both are correct
● What action should be taken when a 23 month old car with
22,000 miles on its odometer fails an emissions inspection
because of a failed emission component?. Answer: Refer the
customer to go to a dealer for the repair
● What is the station license duration ?. Answer: 1 year
● Is sales tax included on the estimate?. Answer: No only on
the invoice
COMPREHENSIVE
STUDY GUIDE 2026 FULL
QUESTIONS
AND SOLUTIONS GRADED A+
● The EGR system works by recirculating a portion of an
engines exhaust back into the combustion chamber to reduce
peak combustion temperatures. Excessive combustion
temperature increases ____ which contributes to the formation
of photochemical smog and ground level ozone.. Answer:
NOX
● Which of the following is NOT considered a sub system of
the computerized emission control system ?. Answer: Antilock
brake module
● When calibrating the bar 97 which gases does it have ?.
Answer: Zero, high, and low
● Vehicles 95' and older are tested on which machine ?.
Answer: OBD 1
● A SPCNS vehicle may be built from ? (3 things ). Answer:
Kit cars, new or used parts, dismantled vehicles that are
reconstructed but do not resemble the original make
,● What is the difference between a three wire oxygen sensor
and a single wire oxygen sensor ?. Answer: A three wire allows
earlier closed loop operation
● Do not inspect kit cars unless they are equipped with ?.
Answer: Bar referee label
● Functional tests are procedures that consist of. Answer: EGR
systems, ignition timing, MIL, OBD, LPFET, fuel cap
(following manufacturer procedures, smog check manual and
as prompted by the inspection system
● On Bar 97 EIS selecting "G" or "government" will chase the
EIS to ask for what to input into the system ?. Answer: BAR
FILE # (thereby preventing a certificate of compliance from
being issues) N/A
● If a vehicle fails smog, and get the needed repairs done,
which station should they refer back to ?. Answer: Any STAR
certified station
● On government vehicles if the odometer is missing or
illegible enter ___?. Answer: None; N/A
● Why was OBD originally introduced on vehicles ?. Answer:
To lower emissions and help with vehicle repair
● If VIN and plate entries are correct and communication
failure continues what should the tech do? How do you
proceed?. Answer: Complete the inspection as promoted by the
EIS.
● Kit cars are a group of what type of vehicles ?. Answer:
SPCNS, grey market and vehicles with engine changes
, ● At what engine idle speed should the engine timing test be
performed ?. Answer: Engine idle must be within plus or minus
100 rpm of the manufacturers specifications
● If a vehicle is registered in the enhanced area but it garaged
in s basic area it must undergo ..?. Answer: An enhanced area
inspection
● Which of the following actions should be taken if a vehicles
timing reads 5 degrees BTDC and the specification of the
vehicle is 8 degrees ?. Answer: Enter "PASS" into the analyzer
for ignition timing and 5 degrees BTDC for the timing reading
● Which of the following is a primary purpose of the smog
check referee ?. Answer: Perform inspection dispute
resolutions
● Inspector A says that aftermarket air intake systems on 95
and older vehicles that do not alter or relocate emission control
components are not required to have a CARB EO #. Tech b
says that OBD II equipped are required to have a CARB EO #
for aftermarket air intake systems. Who is correct ?. Answer:
Both are correct
● What action should be taken when a 23 month old car with
22,000 miles on its odometer fails an emissions inspection
because of a failed emission component?. Answer: Refer the
customer to go to a dealer for the repair
● What is the station license duration ?. Answer: 1 year
● Is sales tax included on the estimate?. Answer: No only on
the invoice
