Key Programming Explained

Why Modern Keys Need Programming

Since the mid-1990s, almost every car sold in the UK has included an immobiliser as standard equipment. An immobiliser prevents the engine from starting unless it receives the correct signal from an authorised key. This signal comes from a chip inside the key that has been programmed to communicate with your specific car.

Cutting a new key blade is only half the job. Without programming, the new key will open the doors but the car won't start.

The Two Types Of Programming

OBD (On-Board Diagnostics) programming — the locksmith connects diagnostic equipment to your car's OBD port (usually under the dashboard) and uses software to add the new key to the car's authorised list. This is the most common method for most modern cars.

Dealer-level programming — some manufacturers (typically German premium brands) use encrypted systems that require manufacturer-specific software. These can still be programmed by a well-equipped specialist locksmith, though the process takes longer and the equipment required is more specialised.

How Long Does It Take?

For most common vehicles — Ford, Vauxhall, Renault, VW, Toyota, Nissan — key programming takes 15–30 minutes once we're on site. For more complex systems, allow up to an hour. We'll always give you a realistic time estimate when you call.

Will A Programmed Key Work Exactly Like The Original?

Yes. A correctly programmed key is functionally identical to the original — the car cannot tell the difference between a key programmed by a dealer and one programmed by a specialist locksmith using the correct equipment.

Can You Programme A Key Without The Car Present?

No — the car must be present. Programming requires a direct connection to the vehicle's ECU, either via the OBD port or, in some cases, directly through the ignition barrel. We come to your vehicle — you don't need to take it anywhere.