Modern car keys contain a transponder chip with a unique encrypted ID. The immobiliser ECU stores a list of approved IDs and only allows the engine to start when one of them is presented at the ignition.
Step 1 — cutting the blade
We cut the mechanical blade to your key code — either from the original key, the door lock or the VIN via the manufacturer's database. A precision laser cutter gets the tolerances right first time.
Step 2 — programming the transponder
We connect to the OBD port (or the immobiliser module directly on older cars), authenticate to the security system and write the new key's encrypted ID into the immobiliser's approved list.
Step 3 — coding the remote
On modern keys we then sync the remote buttons (lock, unlock, boot) to the body control module. On smart keys we also pair the proximity antenna.
Step 4 — testing
We test every function on the new key: engine start, lock, unlock, boot, panic, comfort opening — before handing over.
How long does it take?
Most keys take 30–60 minutes start to finish. Some VAG, BMW and Mercedes smart keys take longer due to the immobiliser security handshake. We quote fixed prices up front.
Related services on StageMyCar: lost car key programming and spare car key service in Slough.