Shop 2015 Audi A5 Lock. Latch. Motor. Door. A8 & S8, w/close assist, from VIN 4E7010182. A8, S8; w Actuator, Assist, Right - OEM Audi Part # 4E0839016AD (4E0-839-016-AD, 4E0839016AB)

Mechanism to secure Door to chassis. Motor to Lock and unLock car Door. Power Door Assist. Actuator. AND Amplifier; switch.

Door Latch AssemblyDoor Lock Actuator Motor

Fits A8, S8

A8 & S8, w/close assist, from VIN 4E7010182. A8, S8; w/Closing Aid; Right.
Door Lock Actuator - Repair or Replace
Your may need a new door lock actuator if your keyless entry doesn't work or your lock button doesn't lock the doors.