What type of Smog Inspection must vehicles registered in a Basic Area receive biennially?

• A. OBD inspection.
• B. Visual inspection only.
• C. ASM inspection.
• D. No inspection required.

Answer: (C)

In a Basic Area, vehicles must receive an ASM inspection every two years. ASM stands for Acceleration Simulation Mode, a comprehensive tailpipe test performed on a drive-cycle simulator (the test stand) to mimic real driving conditions. During the test, an exhaust gas analyzer checks emissions levels while the engine runs through simulated acceleration and speeds, ensuring the vehicle meets its emission standards. The inspector also conducts a visual inspection of the emissions-control system to verify components are present and functioning. This combination provides a true measure of the vehicle’s emissions performance, which is why it’s the required biennial inspection in Basic Areas.