SA in the 4S corner means maintenance consultant. The division of labor in 4S is based on process. When you drive to 4S for maintenance, the first person to receive your registered vehicle information and find the maintenance record is what we often call the front desk maintenance reception.

You tell SA (that is, the maintenance receptionist) what you want to repair, and he will quote you according to the situation. After no objection, SA will hand over the vehicle to the maintenance technician for maintenance. In short, SA stands for Maintenance Reception/Service Consultant.