A car door lock kit comprises all the components required for fixing a vehicle’s door lock, be it installation or replacing an existing lock. Typically, it contains the complete lock mechanism along with all needed brackets, bolts, knobs, and sometimes even keys or key cylinders. In some cases, additional components such as the wiring harnesses associated with electronic door locks are included. These kits are meant as a complete package for do emphasis it yourself mechanics that require simple installation. A car door lock kit makes certain that all the components provided will work together, whether the intent is to fix a malfunctioning door lock or upgrade to a superior system.