Car Immobiliser Fitting: What to Expect

Having an aftermarket immobiliser fitted sounds daunting, but a professional IMMOSTOP install is quick, tidy and completely reversible. Here's exactly what happens — before, during and after — so there are no surprises on the day.

Before the day

You order IMMOSTOP and book a fit with an approved installer near you, arranged through Autosecureshop. Each board is tied to your car and locked to you as the owner, so it's yours alone from the moment it's activated. You'll receive an Installation Certificate for your records and your insurer.

On the day — the install

• Hidden placement. The small board is concealed out of sight, so a thief can't simply find and bypass it.
• Two cut points. The immobiliser interrupts the engine at two separate points — not one — so there's no single wire to defeat. The trigger switches an earth (low-side), the correct defeat-resistant method, driving hidden relays rather than carrying the load itself.
• Non-invasive wiring. It taps into existing circuits cleanly; nothing is cut that can't be returned to standard, and only low-risk circuits are used.
• Typical time. Most cars are done within a couple of hours, though it varies by make — some vehicles take longer to route tidily.

Pairing your phone

With the board in, your installer pairs it to your phone and shows you how it works. From then on IMMOSTOP arms and disarms automatically as you come and go — the engine releases only when your authorised phone is in range, and the system runs in the background with the app closed. Extra drivers can be added with their own phones, a hands-free smart tag acts as a second key, and one-time recovery codes mean you're never truly locked out.

Will it affect my warranty or electrics?

A professional, non-invasive fit taps existing circuits without damage and is fully reversible, so it shouldn't affect your vehicle warranty — but if your car is under manufacturer warranty, it's always worth checking their stance on aftermarket electrical accessories. A proper install by a specialist is clean and leaves no trace when removed.

Insurance, cost and removal

Immobiliser fitting is normally quoted per car, because routing and time vary by make. A quality immobiliser can help your theft risk and sometimes your premium — confirm with your insurer, and ask what they look for. If you ever sell the car or move it on, the system can be removed or transferred, and because boards are owner-locked it can't simply be reused by someone else.

After the fit

You walk away with a car that won't drive for anyone but you — even if they relay or clone the key. No code to type, no fob to carry, nothing to switch on.

More on vehicle security

• What makes a good car immobiliser?
• Immobiliser vs tracker: which actually stops car theft?
• How IMMOSTOP works
• Compare IMMOSTOP vs trackers, steering locks & aftermarket immobilisers
• Car immobiliser fitting in your area
• Autosecureshop — vehicle security specialists