Most modern cars require a chipped transponder key that is programmed to the vehicle before it will start. A car locksmith cuts and programs transponder keys on site.
A transponder key's chip communicates with the immobilizer each time you start the car. If the code is not recognized, the engine may crank without starting or stall right away. That is why a correctly cut key still needs programming to work — the mechanical cut and the electronic pairing are two separate steps.
A car locksmith brings programming equipment to your location to pair the new key with your vehicle. Procedures vary by manufacturer, and some cars enforce a security delay before accepting a new key. Providing the VIN and ownership documents lets the technician confirm the right key and method.
Call for help: (408) 915-4344 — a straight answer and an honest estimate before any work begins.