A relay attack car theft works by extending the radio conversation between your key fob and your vehicle across a distance neither was designed to cover. Two people, two devices. One stands near the wall of your house where the fob sits inside on a hall table, captures its signal and relays it. The second stands at the car, rebroadcasts that signal, and the vehicle believes the key is right there in the driver’s hand. The doors unlock, the push-button start works, and the car drives away without anything being forced or broken.
Nothing is picked, smashed or hot-wired. Your fob never leaves the house. That is what makes it disorienting for owners, and it is why the usual advice about parking in a lit spot misses the point entirely.
Which vehicles are exposed
Only vehicles with passive keyless entry, sometimes badged as smart entry, comfort access or proximity key. The test is simple: if you can walk up with the fob in your pocket and the door unlocks without pressing anything, and the engine starts with a button, the system is passive and the relay technique applies.
If you press a button to unlock and physically insert a key to start, this particular attack does not work on your vehicle. That does not make an older car safe overall, it just means the threat model is different.
What it looks like afterwards
- No broken glass, no damaged lock, no tool marks anywhere on the vehicle.
- The car is simply gone, often overnight from a driveway rather than from a public lot.
- Your keys are exactly where you left them, which is the detail that confuses people and sometimes delays the police report.
- Camera footage shows two people moving deliberately, one lingering near the house wall, the other waiting at the vehicle.
- It takes under a minute from approach to drive-off, which is why Las Vegas driveway thefts of this type are rarely interrupted.
Because there is no forced entry, an insurance conversation can get complicated, and a claim sometimes stalls on the assumption that a key must have been used. That is worth anticipating.
Why Las Vegas driveways are a good target
The valley’s housing stock works against you here. Most homes are single storey with an attached garage and a short driveway, so the distance from the street to the interior wall where keys typically live is often under twenty feet. Add the habit of hanging keys on a hook near the door from the garage, and the fob ends up roughly where a relay device wants it.
Master-planned communities compound it. Long uniform residential streets, low foot traffic after midnight, and easy exits onto a main artery mean a vehicle can be several miles away before anyone notices. The single most effective change most households can make is moving where the keys sleep, which costs nothing.
What actually works
Move the fob away from exterior walls
The relay device has to get close enough to hear the fob. Every wall and every foot of distance degrades that. Keeping keys in an interior room, in a drawer toward the centre of the house, well away from the front door and the garage wall, meaningfully reduces the window without buying anything.
Block the signal properly
A Faraday pouch or a metal tin blocks the fob’s transmission entirely. This works, but only if the pouch is intact and fully closed, and cheap pouches fail once the lining creases. Test yours: put the fob in, seal it, and walk up to the car. If the handle still unlocks, the pouch is not working.
Turn the fob off if your vehicle allows it
A growing number of manufacturers build in a sleep or motion-sensing mode, where the fob stops transmitting after a period of stillness. It is usually a button sequence documented in the owner’s manual and almost nobody knows it exists. Check yours, because it is the cleanest solution available.
Add a visible physical deterrent
A steering wheel lock is unfashionable and genuinely effective, precisely because it cannot be defeated by radio. The point is not that it is impossible to remove, it is that it takes time and attracts attention, and this style of theft depends on neither.
Park to remove the opportunity
In a Las Vegas home with an attached garage, parking inside and closing the door stops the geometry working, because the relay device needs line of access to both the fob and the vehicle. Where a garage is not available, parking so the vehicle is not the nearest thing to the wall the keys sit behind still helps.
What does not work
Wrapping a fob in aluminium foil is unreliable, because the seal is imperfect and it degrades every time you unwrap it. A microwave or a fridge is a folk remedy that people forget, then run, with predictable results. And an alarm that triggers on forced entry contributes nothing here, since the vehicle is being opened with what it considers a legitimate credential.
Removing the fob battery works but makes the key useless day to day, so nobody sustains it. The measures that hold are the ones you will still be doing in six months, which is why distance and a sleep mode beat elaborate routines.
Beyond relay: the related attacks
Worth knowing, because the countermeasures differ. Some thefts use the diagnostic port under the dash to program a fresh key to the vehicle in a couple of minutes, which requires physical entry first and is defeated by a port lock. Others inject signals directly into the vehicle’s wiring at an accessible point such as a headlight housing. Neither is stopped by a Faraday pouch, which is a reason to think in layers rather than buying one product and considering it handled.
If it has already happened
Report it immediately and say plainly that no key was used and none is missing, because that detail shapes the investigation. Tell your insurer the same thing in the same words. If the vehicle is recovered, have every key re-paired and any unknown credential erased before you drive it again, since a key programmed during the theft will otherwise keep working.
Vehicle security guidance from the National Crime Prevention Council still leads with layered deterrence for this reason, and the professional standards body ALOA maintains that key programming should be performed only against verified proof of ownership, which is the safeguard that makes the recovery step meaningful.
If you want your fobs tested, a spare programmed properly, or an honest read on how exposed your particular vehicle is, our automotive locksmith services cover it. Call 702-840-1465 or speak to our technicians and we will tell you what your car actually uses.