During a visual inspection you discover damage on a TWC how do you proceed, how would you enter this in into the EIS or OIS. On the state smog examination you will need to understand the visual inspection definitions and enter the correct results. 


The Onboard Inspection System "OIS" entry has a different entry from the Emission Inspection System "EIS" Smog machine. On the OIS you need to under stand the difference between how you would input the visual inspection results. An emissions control system or component that is missing, modified, or disconnected would be the correct inputs for the EIS. But the OIS you would just enter tampered.

Example: You find that the EGR cooler on a Diesel has been blocked off. 

Definitions of tampered components


All or part of an emissions control system or component which has been removed from the vehicle or engine.

A good example would be someone remove the A.I.R system, Air Injection Reactor or Air Injection System from the vehicle.

Remember any component from the system that's not present the system is considered missing. 


An emission control system or component has been modified if:

• It has been disabled even though it is present and properly connected to the engine and/or vehicle;

• It has been replaced with a component not marketed by its manufacturer for street use on the vehicle,

• An emissions related component of the system has been changed such that there is no capacity for connection with or operation of other emissions control components or systems.

A example would be vacuum hoses rerouted in correctly, a EGR valve crushed from the top, the air filter housing has holes drilled in the side of a over size filter install.


Any hose, wire, belt or component, which is required for the operation of the emission control system is present, but has been disconnected. 

An example would be a vacuum hose is there but not connected, a heat riser tube not connected but present.


Any normal wear, deterioration, or unintentional disturbance that will affect the operation of an emissions control component or system. It is not a condition that occurs as a result of tampering. An unintentional disturbance includes, but is not limited to, a hose, wire, cap, or thermal valve or switch, disturbed and not reconnected or corrected when the vehicle was serviced. 

An example would be corrosion around a thermal vacuum switch or coolant sensor that is broken due to corrosion. Normal wear and tear is considered defective. 


Not Applicable

This entry may only be used when the vehicle is not originally equipped with the particular emissions control component being inspected, or when a particular test cannot be performed due to vehicle incompatibility with inspection equipment. For example, a vehicle did not originally come with an EGR valve from the factory, or a fuel cap adapter does not exist for the vehicle. 

More information click here

                Return to Smog Inspector Home Page

AFOC: Smog Inspector Visual Inspection - Pre Exam

You will need to be sign in to your google account - to take exam 

Click Link Below For Next Smog Inspector Practice Test 

Pre Exam Smog Class Exam: Smog Inspector Smoke Test 


Emission Control 1:

B.A.R. Smog Check

Inspector Level 1

(Inspector "Smog" License):

Engine Fundamentals  

8am - 12:15 pm 

Summer Class

7/5/2022 -8/5/2022

Class # 799065

Emission Control 2:

B.A.R. Smog Check

Inspector Level 2

(Inspector "Smog" License):

Rules and Regulations

8am - 12:15 pm

Summer Classes

7/5/2022 - 8/5/2022

Class # 799067

Engine Performance 1:

 8am - 12: 15 pm

Date: TBD

Class # 799069

Engine Performance 2:

B.A.R. Specified Diagnostic

and Repair Training

(Repair "Smog" License)

Time: TBD 

Date: TBD 

Class # 799071

Emission Control 1

(Inspector "Smog" License):

5:00pm - 8:45 pm

Date: TBD

Class # 799065

Emission Control 2: 

(Inspector "Smog" License):

5:00pm - 8:45 pm

Date: TBD

Class # 799065

Exhaust Emissions (Update Class):

5:30 pm - 8:45 pm 

Tuesday nights: 

Dates: coming soon 

Class # 796070