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

• A. Tampered
• B. CARB aftermarket parts listings
• C. Modified
• D. Defective

Answer: (C)

This item tests how emission-related components are described when they’ve been altered in a way that isolates them from the rest of the system. If a part has been changed so it can’t connect or operate with other emissions controls, that change is classified as a modification—the component itself has been altered from its original state, breaking its integration with the system. That’s why the best fit is modified: the description focuses on the alteration and loss of compatibility within the system.

If it were something like tampering, the emphasis would be on defeating or bypassing the system, which isn’t what this scenario describes. If it were defective, the issue would be a failure or fault, not a deliberate change to its connection with other components. CARB aftermarket parts listings relate to which parts are approved, not the condition described here.