Final answer:
Maintenance code A usually refers to a specified type of routine service for a vehicle, such as an oil change or tire rotation, and does not mean an add-on.
Step-by-step explanation:
The question "Is maintenance code A means add on" seems to be referring to a maintenance schedule or notification code from a vehicle's on-board computer or maintenance manual. In the context of automobile maintenance, Code A typically signifies a particular type of routine service that is required, not necessarily an "add on." The exact meaning of maintenance code A can vary by the manufacturer but generally, it might indicate a need for an oil change, tire rotation, or other basic servicing tasks. It's important to consult your vehicle's owner manual or a professional mechanic to understand the specific services that are denoted by this code.