Emission Control Label
The Emission-Control-Label or each vehicle’s under-hood emission control label is the primary source for emissions control components and will indicate the vehicle’s certification type, U.S. EPA Regulations for Federal vehicles and U.S.California Regulations along with the model year.
There are also some vehicles that may strictly say Canada regulations which can classified as a Grey Market vehicle.
Note: not all emission control components are listed on every Emission-Control-Label usually the major components ate listed, and not for example the PCV or EVAP system will not be listed but is on every vehicle since the early 70"s.
Emission control components are constantly changing it is important to review Emission-Control-Label for the emission control components on that vehicle, since emission control system technology changes and varies between vehicle manufacturers.
A missing or damage emission control label does not automatically fail a smog inspection check. In cases where the emission control label is missing or illegible, the inspector may proceed with the smog check provide as long as the required emission controls components can be determine using other sources. Alldata, Mitchel On Demand or the latest Industry recognize manuals.
For more information look at section 1.3.1 in the Smog Procedure manual
Diesel-powered vehicles may have a second emission control label affixed to the engine.
A missing or illegible emission control label does not constitute a failed smog check inspection.
Remember the under hood Emission-Control-Label can determine if the smog certification will be "Federal" U.S. EPA Regulations or "California" U.S. California Regulations certification.
The model year can determine if the vehicle will require a B.A.R 97 E.I.S inspection or the O.I.S smog inspection.
The Emission-Control-Label can determine if the vehicle is OBD II certified, engine family and size along with the model year.
The Emission-Control-Label can not determine if the vehicle requires a ASM inspection on the B.A.R 97. This will be determine by the OIS or B.A.R. 97 analyzer but OBD II certification can be determine by using the under-hood label which was developed by the EPA and CARB.
On this Emission-Control-Label you can see it has a vacuum diagram showing you how the vacuum lines are connected to each emission control component.
On the state exam they will be asking you if certain emission components are vacuum diagrams are disconnected from a certain emission control component, which emissions would be affected.
This is the same as if the car was driving around with a vacuum line removed from the EGR, do you know which emission or emissions would be affect?
The under hood label also will show you the timing specification and the procedure to check the base timing. A computer control vehicle needs to be in the base timing mode to check the ignition timing correctly or you will read it wrong or you can set the timing incorrectly.