Which term applies to a component that has been replaced with a non-manufacturer component for street use on the vehicle?

• A. Modified
• B. Tampered
• C. Not Applicable
• D. CARB aftermarket parts listings

Answer: (A)

The main idea is that replacing a component with a non-manufacturer part changes the vehicle from its original factory setup. In this context, that kind of change is described as “modified.” It indicates the emissions-related system has been altered from stock, which is what the visual inspector notes for street-use vehicles. This is different from tampering, which implies someone has intentionally defeated or bypassed emissions controls. If the aftermarket part is CARB-approved and properly installed, it can be legal, but the act of using a non-OEM component is still labeled a modification. Not applicable doesn’t fit because the scenario clearly involves a replacement that alters the original equipment.