smog check manual inspector guide

NOx adsorber

This is a type of exhaust gas after-treatment system used on diesel vehicles that must be
visually inspected.




Periodic Trap Oxidizer (PTOX)

This is a type of exhaust gas after-treatment system used on diesel vehicles that must be
visually inspected.




Diesel Particulate Filter (DPF)

This is a type of exhaust gas after-treatment system used on diesel vehicles that must be
visually inspected.




Selective Catalytic Reduction (SCR)

, This is a type of exhaust gas after-treatment system used on diesel vehicles that must be
visually inspected.




Must be in the original configuration with the same number of devices in place, unless changes
are CARB approved/exempted

What are the conditions required for catalysts, filters, and traps to pass visual inspection?




Add-On Aftermarket Parts

This vehicle component must be visually inspected as part of the Other Emission Related
Components/Systems category.




Cylinder Heads

This vehicle component must be visually inspected as part of the Other Emission Related
Components/Systems category.




Exhaust Manifolds

This vehicle component must be visually inspected as part of the Other Emission Related
Components/Systems category.




Intake Manifolds

This vehicle component must be visually inspected as part of the Other Emission Related
Components/Systems category.




Superchargers

This vehicle component must be visually inspected as part of the Other Emission Related
Components/Systems category.




Turbochargers

This vehicle component must be visually inspected as part of the Other Emission Related
Components/Systems category.