Keyless theft

 Perhaps the most worrying aspect of modern vehicle theft is one that doesn’t involve smashing windows or cutting through steering locks. The use of keyless-entry systems means it is all too easy for a thief to access a car, and they can be inside and driving away within seconds. The problem is that the key fob emits a signal that is picked up by the car as the owner approaches, allowing them to open the doors and activate the ignition… and therein lies the weakness. In a ‘relay attack’ a thief uses a device to pick up that signal from the key – when it’s inside your house, say – and send it to a transmitter positioned close to the vehicle. That fools the car into thinking the key is present, and the doors are unlocked.

That also means that once inside, a key fob programmer (too easily bought on the internet) can be plugged into the OBD port and a new fob programmed within seconds. Car makers are well aware of the problem and are working hard on solutions to eliminate the flaws, such as introducing ultra wide-band technology for keys. But there are a few things you can do to minimise the risk. One is to ask the manufacturer if the signal from the fob can be switched off, or the keyless-entry system disabled. Some fobs also feature a motion sensor and go into a ‘sleep mode’ when they are stationary (eg, when sitting inside a house) so they don’t emit a signal.

While you’ll find advice about wrapping the fob in tin foil or putting it in the microwave to block any signals, a better solution is to buy a Faraday pouch (right), a small, metal-lined bag in which to store the key fob and block the signal. There are loads for sale and many are temptingly priced, but you’ll want to ensure that it actually does what it is supposed to. And if you don’t opt for one of these, at least keep keys and fobs away from doors and windows, making it harder to detect the signal they emit.

And on the subject of the OBD there’s one further option to consider, which is some type of locking device. Various types are available, ranging from a simple steel box that locks over the port (although these are often aimed at vans and other commercial vehicles) to a system that uses a switch hidden within the cabin to disable the port. It can then be activated when access is required – for example, when servicing or carrying out fault diagnosis.

Lastly, it’s worth noting that in 2019 Thatcham Research began rating keyless-entry systems for their resistance to a relay attack, so it is worth checking how your vehicle performed.