SMOG CHECK INSPECTOR EXAM (CA) LATEST 2026/2027, HIGH
YIELD PRACTICE QUESTIONS AND A NEW UPDATED STUDY GUIDE
COMPLETE ACCURATE QUESTIONS AND CORRECT SOLUTIONS
WITH DETAILED RATIONALES (100% CORRECT VERIFIED
ANSWERS) NEWEST UPDATED VERSION 2026 EDITION
|GUARANTEED PASS A+ (BRAND NEW!) FULL REVISED
1. A 2005 model year gasoline-powered passenger vehicle is being prepared for a
Smog Check inspection. The inspector notes that the vehicle’s Check Engine Light
(MIL) illuminates when the ignition is turned to the “ON” position (engine off) and
then turns off after the engine is started. According to BAR specifications, this
indicates:
A) The MIL bulb is defective and must be replaced before testing.
B) The vehicle’s OBD II system has failed a previous monitor self-test.
C) The vehicle is ready for inspection because the MIL performs the correct bulb
check and then turns off with engine running.
D) The inspector must abort the test and require a repair for an MIL circuit fault.
Correct Answer: C) The vehicle is ready for inspection because the MIL performs
the correct bulb check and then turns off with engine running.
Rationale: BAR Smog Check procedures require that the MIL illuminate with key
ON/engine OFF as a bulb check, then extinguish after engine start (if no faults
present). This is normal operation; no repair or test abortion is required.
2. During a 2026 Smog Check on a 2017 OBD II vehicle, the inspector connects
the scan tool and finds that the “Catalyst Monitor” status shows “INCOMPLETE”
while all other monitors show “COMPLETE” or “READY.” The vehicle has no
stored DTCs and the MIL is off. Which action is correct?
, A) Fail the vehicle because the Catalyst Monitor must be complete for any OBD II
test.
B) Pass the vehicle because only the Catalyst Monitor is incomplete and the MIL is
off.
C) Abort the test and instruct the customer to drive the vehicle until all monitors
are complete.
D) Perform a two-speed idle tailpipe test instead of the OBD II test.
Correct Answer: B) Pass the vehicle because only the Catalyst Monitor is
incomplete and the MIL is off.
Rationale: For 2000 and newer OBD II gasoline vehicles, the BAR allows up to
one incomplete monitor (except the Evaporative monitor) for model years 2001-
2006, and for 2007+ the catalyst monitor may be incomplete if all others are ready
and no DTCs present. In this scenario, passing is allowed.
3. A 2009 diesel-powered pickup truck (GVWR > 8,500 lbs.) arrives for a Smog
Check in California. The inspector must:
A) Perform only a visible smoke test and a fuel cap integrity check.
B) Perform an OBD II scan plus a loaded mode (opacity) test.
C) Perform a two-speed idle opacity test only.
D) Issue a certificate without testing because diesel vehicles over 8,500 lbs. are
exempt.
Correct Answer: B) Perform an OBD II scan plus a loaded mode (opacity) test.
Rationale: As of 2026, California Smog Check for diesel vehicles 1998 and newer
with GVWR up to 14,000 lbs. requires an OBD II plug-in check (if equipped) and
a loaded mode opacity test using a chassis dynamometer or acceleration
simulation. Two-speed idle is not sufficient for most diesels 2007+.
4. According to the California Smog Check Manual, which of the following
vehicles is exempt from biennial Smog Check requirements in 2026?
A) 2008 gasoline-powered sedan registered as a commuter vehicle.
B) 2015 hybrid electric vehicle with a gross vehicle weight of 4,200 lbs.
, C) 2000 model year diesel motorhome with GVWR 12,000 lbs.
D) 1965 gasoline-powered collector car with valid historical vehicle plates.
Correct Answer: D) 1965 gasoline-powered collector car with valid historical
vehicle plates.
Rationale: Vehicles 1975 and older (gasoline) are exempt from Smog Check in
California. Additionally, 1976-1999 vehicles may have some collector exemptions,
but the clear exemption here is pre-1976. The 1965 vehicle is categorically exempt.
5. An inspector performs a visual inspection on a 2012 Honda Civic. The air
cleaner housing has several small holes drilled through the lid. The correct action
is to:
A) Pass the visual inspection if the air filter is clean and properly seated.
B) Fail the visual inspection due to tampering with the intake air system.
C) Note the condition but continue testing because holes do not affect emissions.
D) Perform a functional test of the air intake temperature sensor before passing.
Correct Answer: B) Fail the visual inspection due to tampering with the intake air
system.
Rationale: Any modification to the air intake system that bypasses, alters, or
reduces the effectiveness of the original air cleaner assembly constitutes tampering.
Holes allow unfiltered air and alter intake vacuum signals, violating BAR visual
inspection criteria.
6. During the OBD II test sequence, the scan tool displays a pending code P0420
(Catalyst System Efficiency Below Threshold). The MIL is off. The inspector
should:
A) Pass the vehicle because pending codes without MIL illumination are not
grounds for failure.
B) Fail the vehicle because any DTC, pending or confirmed, with the MIL
commanded on or off, is a failure.
C) Clear the pending code and re-run the monitors to see if it returns.
D) Note the pending code but only fail if the MIL is on during the test.
, Correct Answer: B) Fail the vehicle because any DTC, pending or confirmed,
with the MIL commanded on or off, is a failure.
Rationale: BAR OBD II test procedures state that the presence of any DTC
(pending or confirmed) related to emissions, regardless of MIL status, results in an
automatic failure. P0420 is an emissions-related code.
7. A 2003 vehicle has a Continuous Variable Transmission (CVT) with no
apparent defects. During the dynamometer acceleration test, the inspector hears an
unusual whine but no abnormal smoke or emissions spikes. The correct procedure
is:
A) Abort the test and mark it as “unsafe to test.”
B) Continue the test because CVTs normally produce some whine; only halt if
metal grinding or slipping occurs.
C) Fail the vehicle for excessive transmission noise regardless of emissions.
D) Call the BAR referee immediately for a waiver.
Correct Answer: B) Continue the test because CVTs normally produce some
whine; only halt if metal grinding or slipping occurs.
Rationale: CVTs often produce a characteristic whine under load. Unless the noise
indicates imminent failure (grinding, clunking, loss of drive), the test can continue
per BAR safety guidelines.
8. The inspector checks the vehicle’s emission label and finds it missing. The
vehicle is a 2019 domestic make. The correct next step is:
A) Look up the correct emission specifications from the BAR online database and
proceed.
B) Fail the vehicle for missing emission label; no exceptions.
C) Contact the manufacturer for a replacement label before testing.
D) Test the vehicle as a federal emissions vehicle using default values.
Correct Answer: B) Fail the vehicle for missing emission label; no exceptions.
Rationale: BAR regulations require the original vehicle emission control
YIELD PRACTICE QUESTIONS AND A NEW UPDATED STUDY GUIDE
COMPLETE ACCURATE QUESTIONS AND CORRECT SOLUTIONS
WITH DETAILED RATIONALES (100% CORRECT VERIFIED
ANSWERS) NEWEST UPDATED VERSION 2026 EDITION
|GUARANTEED PASS A+ (BRAND NEW!) FULL REVISED
1. A 2005 model year gasoline-powered passenger vehicle is being prepared for a
Smog Check inspection. The inspector notes that the vehicle’s Check Engine Light
(MIL) illuminates when the ignition is turned to the “ON” position (engine off) and
then turns off after the engine is started. According to BAR specifications, this
indicates:
A) The MIL bulb is defective and must be replaced before testing.
B) The vehicle’s OBD II system has failed a previous monitor self-test.
C) The vehicle is ready for inspection because the MIL performs the correct bulb
check and then turns off with engine running.
D) The inspector must abort the test and require a repair for an MIL circuit fault.
Correct Answer: C) The vehicle is ready for inspection because the MIL performs
the correct bulb check and then turns off with engine running.
Rationale: BAR Smog Check procedures require that the MIL illuminate with key
ON/engine OFF as a bulb check, then extinguish after engine start (if no faults
present). This is normal operation; no repair or test abortion is required.
2. During a 2026 Smog Check on a 2017 OBD II vehicle, the inspector connects
the scan tool and finds that the “Catalyst Monitor” status shows “INCOMPLETE”
while all other monitors show “COMPLETE” or “READY.” The vehicle has no
stored DTCs and the MIL is off. Which action is correct?
, A) Fail the vehicle because the Catalyst Monitor must be complete for any OBD II
test.
B) Pass the vehicle because only the Catalyst Monitor is incomplete and the MIL is
off.
C) Abort the test and instruct the customer to drive the vehicle until all monitors
are complete.
D) Perform a two-speed idle tailpipe test instead of the OBD II test.
Correct Answer: B) Pass the vehicle because only the Catalyst Monitor is
incomplete and the MIL is off.
Rationale: For 2000 and newer OBD II gasoline vehicles, the BAR allows up to
one incomplete monitor (except the Evaporative monitor) for model years 2001-
2006, and for 2007+ the catalyst monitor may be incomplete if all others are ready
and no DTCs present. In this scenario, passing is allowed.
3. A 2009 diesel-powered pickup truck (GVWR > 8,500 lbs.) arrives for a Smog
Check in California. The inspector must:
A) Perform only a visible smoke test and a fuel cap integrity check.
B) Perform an OBD II scan plus a loaded mode (opacity) test.
C) Perform a two-speed idle opacity test only.
D) Issue a certificate without testing because diesel vehicles over 8,500 lbs. are
exempt.
Correct Answer: B) Perform an OBD II scan plus a loaded mode (opacity) test.
Rationale: As of 2026, California Smog Check for diesel vehicles 1998 and newer
with GVWR up to 14,000 lbs. requires an OBD II plug-in check (if equipped) and
a loaded mode opacity test using a chassis dynamometer or acceleration
simulation. Two-speed idle is not sufficient for most diesels 2007+.
4. According to the California Smog Check Manual, which of the following
vehicles is exempt from biennial Smog Check requirements in 2026?
A) 2008 gasoline-powered sedan registered as a commuter vehicle.
B) 2015 hybrid electric vehicle with a gross vehicle weight of 4,200 lbs.
, C) 2000 model year diesel motorhome with GVWR 12,000 lbs.
D) 1965 gasoline-powered collector car with valid historical vehicle plates.
Correct Answer: D) 1965 gasoline-powered collector car with valid historical
vehicle plates.
Rationale: Vehicles 1975 and older (gasoline) are exempt from Smog Check in
California. Additionally, 1976-1999 vehicles may have some collector exemptions,
but the clear exemption here is pre-1976. The 1965 vehicle is categorically exempt.
5. An inspector performs a visual inspection on a 2012 Honda Civic. The air
cleaner housing has several small holes drilled through the lid. The correct action
is to:
A) Pass the visual inspection if the air filter is clean and properly seated.
B) Fail the visual inspection due to tampering with the intake air system.
C) Note the condition but continue testing because holes do not affect emissions.
D) Perform a functional test of the air intake temperature sensor before passing.
Correct Answer: B) Fail the visual inspection due to tampering with the intake air
system.
Rationale: Any modification to the air intake system that bypasses, alters, or
reduces the effectiveness of the original air cleaner assembly constitutes tampering.
Holes allow unfiltered air and alter intake vacuum signals, violating BAR visual
inspection criteria.
6. During the OBD II test sequence, the scan tool displays a pending code P0420
(Catalyst System Efficiency Below Threshold). The MIL is off. The inspector
should:
A) Pass the vehicle because pending codes without MIL illumination are not
grounds for failure.
B) Fail the vehicle because any DTC, pending or confirmed, with the MIL
commanded on or off, is a failure.
C) Clear the pending code and re-run the monitors to see if it returns.
D) Note the pending code but only fail if the MIL is on during the test.
, Correct Answer: B) Fail the vehicle because any DTC, pending or confirmed,
with the MIL commanded on or off, is a failure.
Rationale: BAR OBD II test procedures state that the presence of any DTC
(pending or confirmed) related to emissions, regardless of MIL status, results in an
automatic failure. P0420 is an emissions-related code.
7. A 2003 vehicle has a Continuous Variable Transmission (CVT) with no
apparent defects. During the dynamometer acceleration test, the inspector hears an
unusual whine but no abnormal smoke or emissions spikes. The correct procedure
is:
A) Abort the test and mark it as “unsafe to test.”
B) Continue the test because CVTs normally produce some whine; only halt if
metal grinding or slipping occurs.
C) Fail the vehicle for excessive transmission noise regardless of emissions.
D) Call the BAR referee immediately for a waiver.
Correct Answer: B) Continue the test because CVTs normally produce some
whine; only halt if metal grinding or slipping occurs.
Rationale: CVTs often produce a characteristic whine under load. Unless the noise
indicates imminent failure (grinding, clunking, loss of drive), the test can continue
per BAR safety guidelines.
8. The inspector checks the vehicle’s emission label and finds it missing. The
vehicle is a 2019 domestic make. The correct next step is:
A) Look up the correct emission specifications from the BAR online database and
proceed.
B) Fail the vehicle for missing emission label; no exceptions.
C) Contact the manufacturer for a replacement label before testing.
D) Test the vehicle as a federal emissions vehicle using default values.
Correct Answer: B) Fail the vehicle for missing emission label; no exceptions.
Rationale: BAR regulations require the original vehicle emission control
