Texas Emissions Inspections Exam Study Guide Latest 2026
Updated Questions and Verified 100% Solutions (2026/2027)
Grade: A+|Status: Guaranteed Pass
What is the name of the amber colored warning light that is illuminated by the OBD system
when a malfunction occurs? - Answers -Malfunction Indicator Light
When severe misfire occurs that could damage the catalytic converter, what does the MIL do? -
Answers -Flashes on and off once per second
What two checks are required of the MIL:
i. Key-On Engine Off (KOEO)
ii. Key-On Engine Running (KOER)
iii. Key-Off Engine Off (KOEO)
iv. Key-Off Engine Off (KOEO) - Answers -i and ii
What are you checking for during the Key On, Engine Off (KOEO) inspection? - Answers -That the
MIL comes on when the ignition key is turned to the KOEO position
True or False: On some vehicles, the MIL will illuminate very briefly when the key is turned to
the KOEO position, and then will go out. This is not acceptable. - Answers -False
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, What are you checking for during the Key On, Engine Running inspection? - Answers -If the MIL
remains on with the engine running, indicating that there is a problem with the vehicle
What does the MIL look like visually? - Answers -It will say "Service Engine Soon"
It will say "Check engine"
The international engine symbol
What information will be downloaded from the OBDII system? - Answers -MIL status, readiness
status, and diagnostic trouble codes
True or False: MIL status refers to whether or not the PCM has commanded the MIL to be on. -
Answers -True
What does it mean when a component that has been diagnosed is termed "ready"? - Answers -
The component was tested by the OBDII system
What does it mean when the non-continuous components or systems are set to "not ready"? -
Answers -The battery has been disconnected or the codes have been cleared
True or False: OBD equipped vehicles model year 1996 through 2000 must fail the emissions
test in an I/M program if more than two OBD monitors are set to Not Ready. - Answers -True
2|Page
Updated Questions and Verified 100% Solutions (2026/2027)
Grade: A+|Status: Guaranteed Pass
What is the name of the amber colored warning light that is illuminated by the OBD system
when a malfunction occurs? - Answers -Malfunction Indicator Light
When severe misfire occurs that could damage the catalytic converter, what does the MIL do? -
Answers -Flashes on and off once per second
What two checks are required of the MIL:
i. Key-On Engine Off (KOEO)
ii. Key-On Engine Running (KOER)
iii. Key-Off Engine Off (KOEO)
iv. Key-Off Engine Off (KOEO) - Answers -i and ii
What are you checking for during the Key On, Engine Off (KOEO) inspection? - Answers -That the
MIL comes on when the ignition key is turned to the KOEO position
True or False: On some vehicles, the MIL will illuminate very briefly when the key is turned to
the KOEO position, and then will go out. This is not acceptable. - Answers -False
1|Page
, What are you checking for during the Key On, Engine Running inspection? - Answers -If the MIL
remains on with the engine running, indicating that there is a problem with the vehicle
What does the MIL look like visually? - Answers -It will say "Service Engine Soon"
It will say "Check engine"
The international engine symbol
What information will be downloaded from the OBDII system? - Answers -MIL status, readiness
status, and diagnostic trouble codes
True or False: MIL status refers to whether or not the PCM has commanded the MIL to be on. -
Answers -True
What does it mean when a component that has been diagnosed is termed "ready"? - Answers -
The component was tested by the OBDII system
What does it mean when the non-continuous components or systems are set to "not ready"? -
Answers -The battery has been disconnected or the codes have been cleared
True or False: OBD equipped vehicles model year 1996 through 2000 must fail the emissions
test in an I/M program if more than two OBD monitors are set to Not Ready. - Answers -True
2|Page
