Car door lock actuators are designed to lock and unlock a door by using a simple press of a button or turning a key.A failed door lock actuator may produce a noise when the power door locks are locked or unlocked. FAERSI Door Lock Actuator is made with high-quality plastic and identical in fit, form and function to the original, realizing direct replacement & easy to install features. A door lock actuator is limited to only one door so please check the position before purchasing.