I had no idea what a lock actuator was. However, I knew something needed to be replaced in Andell’s prized car, his old BMW. It is now 11 years old. The left rear door suddenly made multiple clicking noises when the unlock key was pressed. It didn’t even open easily. He found a youtube link and bought the part for under $100 and in less than 20 minutes had it working like new. No more clicking noises. So long as no hurricane comes our way, this car should last for another many thousand miles!
This is the pic of the part he took out.