The systemswe trust.

1. 01

   Relay attack

   Two devices relay the signal from a keyless fob inside your house, so the car thinks the key is standing next to it.

   How we stop it: A CAN immobiliser adds a second step, a PIN on the car's own buttons or a tag or phone, so the relayed signal alone won't start the engine.

2. 02

   Key programming via the OBD port

   With access to the diagnostic port, a blank key can be programmed to the car in minutes.

   How we stop it: An aftermarket immobiliser works independently of the car's key system, so a newly programmed key still can't drive it away.

3. 03

   CAN injection

   Thieves reach the vehicle's wiring, often behind a headlight or wheel arch, and send fake messages that unlock and start the car.

   How we stop it: The immobiliser keeps the engine disabled until its own authorisation is given, which injected messages don't provide.

4. 04

   Lost or stolen keys

   A key that has gone missing can still open and start the car, which matters if it went missing with your address.

   How we stop it: New keys are programmed and lost ones are removed from the car's memory, so they stop working.

If the worst happens, a Thatcham-certified S5 or S7 tracker helps get the vehicle back, and is often what insurers ask for. Get a fixed quote for a tracker.