Buy 2003 Audi A4 3.0L V6 A/T Quattro Base Sedan Lock. Door. Motor. Latch. A4; Left. S4, RS4; Left - OEM Audi Part # 8E0839015D (4B0839015E, 8E0-839-015-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; Left. S4, RS4; Left.
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.