But they work differently, fit differently, and suit different drivers. If you're stuck choosing between them, this guide gives you a straight answer based on our day-to-day installer experience across London and Kent — including which one we recommend more often, and why.

First — Why You Need an Immobiliser At All

Modern keyless-entry cars are more convenient than ever, but they're also easier to steal. Here's the problem in short:

Relay theft uses two cheap devices — one to pick up the signal from your key fob (even through walls and windows, from inside your house), and one to clone that signal next to your car. The car thinks your key is nearby, unlocks, starts, and drives away. No force, no window damage, no noise.

According to UK insurance data, relay attacks now account for the majority of modern car thefts. High-value models like Range Rover Sport, BMW X5, Audi Q7, Mercedes GLC, Toyota Hilux, Lexus RX, and Ford Transit Custom are particularly targeted. Some insurers now require aftermarket immobilisers for comprehensive cover on these vehicles.

Factory immobilisers — the ones built into the car — can't stop relay theft, because the attack works by mimicking your key. An aftermarket immobiliser adds a separate layer that the relay attack can't bypass.

That's where Ghost 2 and CAN Phantom come in.

How They Work (Both Solve the Same Problem, Differently)

Ghost 2 (Autowatch)

Ghost 2 is a CAN-bus-based immobiliser that integrates with your car's existing electronic system. When armed, the vehicle won't start until you enter a PIN sequence using the existing buttons on the dashboard or steering wheel — for example, "steering wheel + / – / – / + / volume-up". Without the correct sequence, the engine simply won't crank, even if a thief has your key or has cloned its signal.

Key characteristics:

• No visible components — invisible to thieves because there's no added key fob, dongle, or tag
• No extra key to lose — your PIN is your authentication
• Thatcham-certified (TQA – approved for insurance)
• Integrates via CAN-bus — no wire splicing into ignition systems
• Royale Car Keys installs Ghost 2 in around 2 hours with individual induction for your specific vehicle
• 5-year warranty on Ghost 2 installations from Royale Car Keys

CAN Phantom (Castlegate)

CAN Phantom takes a slightly different approach. It also uses the car's CAN-bus system, but arming and disarming is typically done via a small secure ADR tag (Authorised Driver Recognition) that must be present in the vehicle to start it. Without the tag, the car won't crank — even with your genuine key.

Some CAN Phantom versions offer PIN-code fallback in case the tag is lost, similar to Ghost 2.

Key characteristics:

• ADR tag authentication — a second, separate authorisation token
• Plug-in installation — uses the vehicle's OBD-II port and CAN-bus
• Optional PIN fallback on some versions
• Thatcham-certified (TQA – approved for insurance)

Our Honest Recommendation: Ghost 2 for Most Drivers

Here's the genuine answer based on our installer experience across hundreds of installs in London and Kent:

For most keyless-entry cars — Range Rover, Toyota, Lexus, Mercedes, BMW — we recommend Ghost 2 as a "must-have" device. It's the more popular choice among our customers, and it's the one we install most often.

The main reasons drivers pick Ghost 2:

• Nothing extra to carry — your PIN is your key. No tag in your wallet, no second device to keep track of.
• Truly invisible — a thief inspecting the car can't see any aftermarket security at all
• PIN can be changed at any time without revisiting an installer
• Easy to share with authorised drivers (family, partner, valet) — just give them the PIN; revoke by changing it
• Strong warranty — our 5-year warranty is significantly longer than most competitor offerings

Where CAN Phantom can still be the right choice:

• You strongly prefer a physical token over remembering a PIN (some drivers, especially those who already use key tokens for other things, feel more comfortable with a tag)
• You manage a fleet with frequently-changing drivers — it's sometimes easier to issue and revoke physical tags than to share PINs across multiple shifts
• You don't trust yourself with PIN management — losing a tag is a fixable problem; forgetting your PIN at 6am with a dead phone battery is a worse one

For the vast majority of residential drivers in London and Kent, Ghost 2 is our default recommendation.

At-a-Glance Comparison

What About Cost?

Both systems start from £150 for installation — final price varies based on vehicle make, model, and complexity of the CAN-bus setup. Here's what affects final cost:

• Vehicle model — some cars (especially newer Range Rovers and BMWs with highly integrated electronics) take longer to install
• Installation location — mobile installation at your home, office, or fleet yard is included in our pricing
• Any additional features — e.g. trackers, keyless-entry blockers, or auxiliary security

For our full breakdown on vehicle security pricing, see our prices page.

The Bigger Picture — Multi-Layer Security

While Ghost 2 (and CAN Phantom) are excellent standalone solutions, the most security-conscious owners combine them with other measures:

• Faraday pouch for your key fob at home (blocks relay attack at the source)
• Steering wheel lock (visual deterrent)
• GPS tracker (recovery if the car is somehow still stolen)
• OBD port protection (prevents thieves programming a new key via the diagnostic port)
• Ignition security — a worn or damaged ignition is a vulnerability in itself; if you're noticing problems, see our ignition barrel repair guide for a same-day fix

We install all of these systems. Contact us for a custom security consultation for your vehicle.

Which Cars Benefit Most?

These are the vehicles most commonly targeted for aftermarket immobiliser installation across the UK:

• Range Rover / Range Rover Sport / Evoque — the most stolen vehicle in the UK for several consecutive years
• BMW X5, X6, 3 Series, 5 Series
• Audi Q5, Q7, A4, A6
• Mercedes-Benz GLC, GLE, C-Class, E-Class
• Toyota Hilux, Land Cruiser, RAV4 (heavily targeted by organised theft rings)
• Lexus RX, NX
• Ford Transit Custom (both for cargo protection and vehicle theft)

If you drive any of these and don't currently have an aftermarket immobiliser, it's a genuine priority. Insurance companies increasingly expect it, and replacement cost after theft is catastrophic.

Getting One Fitted

We install Ghost 2 and CAN Phantom immobilisers at your location anywhere across Greater London, Kent, Essex, Surrey, and Sussex. Mobile installation is included in the price — we come to you anywhere in our service area.

All work is backed by our warranty (5 years on Ghost 2 installations) and full insurance.

To book a consultation or installation, call 07777 676261 or WhatsApp us on +44 7777 676261. For non-urgent queries, use our contact form and we'll reply within the hour.

See also: our guides on auto locksmith services in Dartford, Greenwich, and Gravesend — all include security installation coverage. For ignition issues, see our ignition barrel repair guide.