Buy 2003 Audi A4 Lock. Latch. Motor. Door. A4; Right. S4, RS4; Right. Door Lock Actuator - Repair - OEM Audi Part # 8E0839016D (4B0839016E, 8E0-839-016-D)

From Chassis/VIN 8E-2-000 001. Incl.Latch. Mechanism to secure Door to Chassis. Motor to Lock and unLock car Door. Actuator. AND Amplifier; switch.

Door Latch AssemblyDoor Lock Actuator Motor

Fits A4, S4

A4; Right. S4, RS4; Right.
Door Lock Actuator - Repair or Replace
Your 2003 Audi A4 may need a new door lock actuator if your keyless entry doesn't work or your lock button doesn't lock the doors.