Keyless Car Theft in NZ: What Actually Works

If your car unlocks as you walk up to it and starts with a button, it is a keyless entry vehicle. That convenience works by the car and the key holding a constant low-power conversation, and that conversation is what a relay attack exploits.

How the attack works

One device near your front door picks up the key signal and passes it to a second device beside the car, which then believes the key is present. The car unlocks and starts normally.

Nothing is broken and nothing is forced. From the car's point of view the owner is standing next to it with the key, which is exactly why the immobiliser does not intervene.

Keep it in proportion

Most vehicle crime in New Zealand is still opportunistic: unlocked doors, valuables on seats, and keys taken during a burglary. Relay theft is a real technique but it targets specific vehicles, and the practical defences are cheap.

If your car uses a traditional key you turn in the ignition, this does not apply to you at all.

The single most effective step

Where you keep the key at night. A signal-blocking pouch costs very little and stops the conversation entirely. A metal tin works on the same principle.

What does not work is a drawer in the hallway, because the signal passes straight through timber. The pouch is doing the work, not the drawer.

Distance and position

Keep keys away from the front door and from external walls. Distance matters more than people expect, and moving the key to the middle of the house makes the relay much harder.

The same applies to the spare — a second fob by the door is the same risk twice. Where to put it is covered in where to keep your spare car key.

Check your car's own setting

Many makes from the last few years have a motion-sensing key that goes to sleep when it has been still for a few minutes, and it is often switched off by default. Your handbook will say.

It is free, it takes a minute, and it removes the overnight risk entirely on the vehicles that have it.

Physical deterrents still earn their place

A steering wheel lock takes seconds to fit and is visible from outside, which is usually enough to make somebody choose a different car. The fuller case is in are steering wheel locks worth it.

In a Hamilton context

Most vehicle crime here remains opportunistic rather than technical, so the basics still do the heavy lifting: nothing visible on the seats, doors actually locked, car off the street where possible.

The pouch is worth having if your vehicle is keyless and parks on an open driveway, which describes a great many Hamilton houses.

And if a key has gone missing rather than simply being out of sight, treat it as urgent — the fix is deleting it from the vehicle, covered on our lost car keys page and in car keys stolen.