SMOG LEVEL 2 ADVANCED EMISSIONS FINAL EXAM
REVIEW 2026/2027 | Diagnostics & Repair | 100%
Correct Answers | Latest Version | Pass Guaranteed -
A+ Graded
Section 1: Advanced OBD-II Diagnostics & Mode $06 Data (Q1-15)
Q1. A technician retrieves Mode $06 data on a 2019 Toyota Camry 2.5L. TID $01 CID
$01 shows O2 Sensor Monitor Bank 1 Sensor 1 with Test Value = 0.85V, Min Limit =
0.10V, Max Limit = 0.90V. What is the correct diagnostic conclusion?
A. The oxygen sensor has failed because the test value is too close to the maximum
limit.
B. The monitor has passed because the test value falls within the min/max limits.
C. The catalyst efficiency is borderline and requires replacement.
D. The O2 sensor heater circuit has excessive resistance.
B. The monitor has passed because the test value falls within the min/max limits.
[CORRECT]
Rationale: Mode $06 evaluates pass/fail based on whether the test value falls within
the manufacturer-specified min/max limits. 0.85V is within the 0.10V–0.90V range,
indicating the sensor monitor passed. Choice A misinterprets proximity to limits as
failure; C confuses O2 sensor monitor with catalyst monitor; D introduces heater
circuit data not present in TID $01.
Correct Answer: B
Q2. During Mode $06 analysis on a 2018 Honda Accord 1.5L turbo, TID $02 CID $01
(Catalyst Monitor Bank 1) displays Test Value = 0.52, Min Limit = 0.00, Max Limit =
0.45. Which repair direction is indicated?
A. Replace Bank 1 catalytic converter immediately.
B. The catalyst monitor has passed; no action required.
C. The catalyst monitor has failed; investigate O2 sensors before condemning the
,converter.
D. Perform an EVAP smoke test to verify purge flow.
C. The catalyst monitor has failed; investigate O2 sensors before condemning the
converter. [CORRECT]
Rationale: The test value 0.52 exceeds the maximum limit of 0.45, indicating a failed
catalyst monitor. Per Level 2 diagnostic protocol, O2 sensor response must be
verified before replacing the catalyst to avoid misdiagnosis. Choice A skips
mandatory O2 sensor confirmation; B incorrectly interprets an out-of-range value as
pass; D addresses an unrelated system.
Correct Answer: C
Q3. Mode $06 data on a 2020 Ford F-150 3.5L EcoBoost shows Misfire Monitor TID
$0A CID $03 (Cylinder 3) with a profile correction count of 18 in the 1200–1400 RPM
range. The specification states counts must not exceed 15. What does this indicate?
A. Random cylinder misfire caused by vacuum leak.
B. Specific cylinder misfire on Cylinder 3 within the 1200–1400 RPM range.
C. Ignition coil primary circuit short on Cylinder 4.
D. Fuel injector balance test failure on Bank 2.
B. Specific cylinder misfire on Cylinder 3 within the 1200–1400 RPM range.
[CORRECT]
Rationale: Mode $06 misfire monitor profile correction counts are RPM-range
specific and cylinder-specific. A count of 18 exceeding the 15-count limit on CID $03
indicates Cylinder 3 misfire in that RPM window. Choice A describes random misfire
which would show across multiple cylinders; C references the wrong cylinder and
wrong diagnostic method; D refers to Bank 2 when the data indicates Bank 1 Cylinder
3.
Correct Answer: B
,Q4. A technician reviews Mode $06 on a 2017 Chevrolet Silverado 5.3L. TID $05 CID
$01 (EVAP Monitor 0.020" leak detection) shows Test Value = 0.018", Min Limit =
0.000", Max Limit = 0.020". The test value is 0.018". What is the proper
interpretation?
A. The EVAP system has a 0.018" leak and requires smoke testing.
B. The monitor passed with adequate margin; the system is sealed.
C. The monitor failed because the value is too close to the threshold.
D. The purge solenoid duty cycle is insufficient.
B. The monitor passed with adequate margin; the system is sealed. [CORRECT]
Rationale: The test value 0.018" is within the 0.000"–0.020" specification range,
indicating the EVAP leak detection monitor passed. The system meets the 0.020"
sealing threshold. Choice A misinterprets the test value as an actual leak size rather
than a monitor test result; C incorrectly assumes proximity to max limit constitutes
failure; D introduces unrelated purge solenoid data.
Correct Answer: B
Q5. On a 2021 Nissan Altima 2.5L, Mode $06 TID $04 CID $02 (O2 Sensor Monitor
Bank 1 Sensor 2) shows Test Value = 0.15V, Min Limit = 0.10V, Max Limit = 0.80V.
The downstream O2 sensor is showing slow cross-counts on the scan tool. What is
the most likely cause?
A. The downstream O2 sensor has failed and requires replacement.
B. The catalyst is operating normally and the sensor is performing correctly.
C. The upstream O2 sensor has a rich bias causing downstream saturation.
D. The monitor passed, but the slow cross-counts may indicate catalyst efficiency
degradation.
D. The monitor passed, but the slow cross-counts may indicate catalyst efficiency
degradation. [CORRECT]
Rationale: While Mode $06 shows the sensor monitor passed (0.15V within limits),
slow cross-counts on a downstream O2 sensor typically indicate reduced catalyst
oxygen storage capacity—an early indicator of catalyst degradation before TID $02
, failure. Choice A condemns the sensor prematurely; B ignores the waveform
behavior; C incorrectly blames the upstream sensor for downstream switching
patterns.
Correct Answer: D
Q6. A 2019 Subaru Outback 2.5L shows Mode $06 TID $07 CID $01 (EGR Monitor)
with Test Value = 35%, Min Limit = 10%, Max Limit = 40%. The vehicle has P0401
(EGR Flow Insufficient) stored. What does the Mode $06 data suggest?
A. The EGR monitor passed, so the P0401 is intermittent and can be erased.
B. The EGR flow test passed but the P0401 indicates a different EGR system fault.
C. The EGR valve is stuck closed despite the monitor passing.
D. The DPFE sensor is reading incorrectly, causing both the pass and the DTC.
B. The EGR flow test passed but the P0401 indicates a different EGR system fault.
[CORRECT]
Rationale: Mode $06 shows the specific monitor test passed (35% within 10%–40%),
but P0401 indicates insufficient flow detected during a different operating condition
or test cycle. The monitor that passed may evaluate EGR position feedback rather
than actual flow rate. Choice A incorrectly assumes passing one monitor invalidates
the DTC; C contradicts the data; D assumes sensor failure without evidence.
Correct Answer: B
Q7. Mode $06 on a 2020 Hyundai Sonata 2.0L turbo shows TID $03 CID $01 (O2
Sensor Response Rate Monitor Bank 1 Sensor 1) with Test Value = 125ms, Min Limit
= 100ms, Max Limit = 300ms. The technician notes the sensor switches 4 times in 10
seconds at 2500 RPM. What is the correct assessment?
A. The sensor response rate monitor passed, but cross-count frequency is below
specification.
B. Both response rate and switching frequency are within acceptable limits.
REVIEW 2026/2027 | Diagnostics & Repair | 100%
Correct Answers | Latest Version | Pass Guaranteed -
A+ Graded
Section 1: Advanced OBD-II Diagnostics & Mode $06 Data (Q1-15)
Q1. A technician retrieves Mode $06 data on a 2019 Toyota Camry 2.5L. TID $01 CID
$01 shows O2 Sensor Monitor Bank 1 Sensor 1 with Test Value = 0.85V, Min Limit =
0.10V, Max Limit = 0.90V. What is the correct diagnostic conclusion?
A. The oxygen sensor has failed because the test value is too close to the maximum
limit.
B. The monitor has passed because the test value falls within the min/max limits.
C. The catalyst efficiency is borderline and requires replacement.
D. The O2 sensor heater circuit has excessive resistance.
B. The monitor has passed because the test value falls within the min/max limits.
[CORRECT]
Rationale: Mode $06 evaluates pass/fail based on whether the test value falls within
the manufacturer-specified min/max limits. 0.85V is within the 0.10V–0.90V range,
indicating the sensor monitor passed. Choice A misinterprets proximity to limits as
failure; C confuses O2 sensor monitor with catalyst monitor; D introduces heater
circuit data not present in TID $01.
Correct Answer: B
Q2. During Mode $06 analysis on a 2018 Honda Accord 1.5L turbo, TID $02 CID $01
(Catalyst Monitor Bank 1) displays Test Value = 0.52, Min Limit = 0.00, Max Limit =
0.45. Which repair direction is indicated?
A. Replace Bank 1 catalytic converter immediately.
B. The catalyst monitor has passed; no action required.
C. The catalyst monitor has failed; investigate O2 sensors before condemning the
,converter.
D. Perform an EVAP smoke test to verify purge flow.
C. The catalyst monitor has failed; investigate O2 sensors before condemning the
converter. [CORRECT]
Rationale: The test value 0.52 exceeds the maximum limit of 0.45, indicating a failed
catalyst monitor. Per Level 2 diagnostic protocol, O2 sensor response must be
verified before replacing the catalyst to avoid misdiagnosis. Choice A skips
mandatory O2 sensor confirmation; B incorrectly interprets an out-of-range value as
pass; D addresses an unrelated system.
Correct Answer: C
Q3. Mode $06 data on a 2020 Ford F-150 3.5L EcoBoost shows Misfire Monitor TID
$0A CID $03 (Cylinder 3) with a profile correction count of 18 in the 1200–1400 RPM
range. The specification states counts must not exceed 15. What does this indicate?
A. Random cylinder misfire caused by vacuum leak.
B. Specific cylinder misfire on Cylinder 3 within the 1200–1400 RPM range.
C. Ignition coil primary circuit short on Cylinder 4.
D. Fuel injector balance test failure on Bank 2.
B. Specific cylinder misfire on Cylinder 3 within the 1200–1400 RPM range.
[CORRECT]
Rationale: Mode $06 misfire monitor profile correction counts are RPM-range
specific and cylinder-specific. A count of 18 exceeding the 15-count limit on CID $03
indicates Cylinder 3 misfire in that RPM window. Choice A describes random misfire
which would show across multiple cylinders; C references the wrong cylinder and
wrong diagnostic method; D refers to Bank 2 when the data indicates Bank 1 Cylinder
3.
Correct Answer: B
,Q4. A technician reviews Mode $06 on a 2017 Chevrolet Silverado 5.3L. TID $05 CID
$01 (EVAP Monitor 0.020" leak detection) shows Test Value = 0.018", Min Limit =
0.000", Max Limit = 0.020". The test value is 0.018". What is the proper
interpretation?
A. The EVAP system has a 0.018" leak and requires smoke testing.
B. The monitor passed with adequate margin; the system is sealed.
C. The monitor failed because the value is too close to the threshold.
D. The purge solenoid duty cycle is insufficient.
B. The monitor passed with adequate margin; the system is sealed. [CORRECT]
Rationale: The test value 0.018" is within the 0.000"–0.020" specification range,
indicating the EVAP leak detection monitor passed. The system meets the 0.020"
sealing threshold. Choice A misinterprets the test value as an actual leak size rather
than a monitor test result; C incorrectly assumes proximity to max limit constitutes
failure; D introduces unrelated purge solenoid data.
Correct Answer: B
Q5. On a 2021 Nissan Altima 2.5L, Mode $06 TID $04 CID $02 (O2 Sensor Monitor
Bank 1 Sensor 2) shows Test Value = 0.15V, Min Limit = 0.10V, Max Limit = 0.80V.
The downstream O2 sensor is showing slow cross-counts on the scan tool. What is
the most likely cause?
A. The downstream O2 sensor has failed and requires replacement.
B. The catalyst is operating normally and the sensor is performing correctly.
C. The upstream O2 sensor has a rich bias causing downstream saturation.
D. The monitor passed, but the slow cross-counts may indicate catalyst efficiency
degradation.
D. The monitor passed, but the slow cross-counts may indicate catalyst efficiency
degradation. [CORRECT]
Rationale: While Mode $06 shows the sensor monitor passed (0.15V within limits),
slow cross-counts on a downstream O2 sensor typically indicate reduced catalyst
oxygen storage capacity—an early indicator of catalyst degradation before TID $02
, failure. Choice A condemns the sensor prematurely; B ignores the waveform
behavior; C incorrectly blames the upstream sensor for downstream switching
patterns.
Correct Answer: D
Q6. A 2019 Subaru Outback 2.5L shows Mode $06 TID $07 CID $01 (EGR Monitor)
with Test Value = 35%, Min Limit = 10%, Max Limit = 40%. The vehicle has P0401
(EGR Flow Insufficient) stored. What does the Mode $06 data suggest?
A. The EGR monitor passed, so the P0401 is intermittent and can be erased.
B. The EGR flow test passed but the P0401 indicates a different EGR system fault.
C. The EGR valve is stuck closed despite the monitor passing.
D. The DPFE sensor is reading incorrectly, causing both the pass and the DTC.
B. The EGR flow test passed but the P0401 indicates a different EGR system fault.
[CORRECT]
Rationale: Mode $06 shows the specific monitor test passed (35% within 10%–40%),
but P0401 indicates insufficient flow detected during a different operating condition
or test cycle. The monitor that passed may evaluate EGR position feedback rather
than actual flow rate. Choice A incorrectly assumes passing one monitor invalidates
the DTC; C contradicts the data; D assumes sensor failure without evidence.
Correct Answer: B
Q7. Mode $06 on a 2020 Hyundai Sonata 2.0L turbo shows TID $03 CID $01 (O2
Sensor Response Rate Monitor Bank 1 Sensor 1) with Test Value = 125ms, Min Limit
= 100ms, Max Limit = 300ms. The technician notes the sensor switches 4 times in 10
seconds at 2500 RPM. What is the correct assessment?
A. The sensor response rate monitor passed, but cross-count frequency is below
specification.
B. Both response rate and switching frequency are within acceptable limits.
