Can thieves store the frequency of a keyless key to steal your car later?

Even if you have a Faraday bag, can thieves detect the key frequency as you park-up? Then the thieves have the signal stored in their relay device, or does the key have to be active for them to gain entry?

Asked on 15 January 2019 by NickNike

Answered by Georgia Petrie
As far as we're aware, no. Our understanding of these devices is that they just extend the signal from the key when it's in range. I don't think the device can store a key's signal.
Similar questions
I’ve just bought a Ford Fiesta Vignale. Should I turn off the keyless entry or have the changes made it more secure?
Ease of theft of cars with keyless entry systems by relay attack is very much in the news. Is there a reliable way of preventing this type of attack? A Faraday screened key pouch is offered as a solution....
I will take delivery of a new Jaguar XFin a couple of weeks. One downside is the thought that the keyless entry system may allow determined thieves to steal the car. Is my new car more or less vulnerable...

Ask Honest John

Value my car