Cobra AK4138 | Obsessive Vehicle Security

Cobra AK4138 remote car alarm and immobiliser

When it comes to high-end vehicle security, the Cobra AK4138 stands in a league of its own. Combining the advanced features of the AK4198 and the 8509, this system delivers a full Thatcham Category 1 alarm and immobiliser setup. This is the highest recognised standard in car alarms. You can check this on the Thatcham Website.

Perfect when you want uncompromising security, the AK4138 or 4138 as it is often referred to as, offers rugged reliability, flexible installation, and intelligent protection features you won’t find in typical alarms.

Why Choose the Cobra AK4138?

Thatcham Cat 1 Certified – Meets the strictest international security standards.
Modular Design – Siren, alarm ECU, and immobiliser are separate units, connected via a secure digital bus network.
Three Immobiliser Cuts as Standard – With optional expansion for even greater theft protection.
Digital Bus Monitoring – Detects tampering instantly, even when disarmed.
Rugged Remotes & Waterproof Siren – Built to last, even in tough NZ conditions.
Factory-Look Sensors – Ultrasonics that blend seamlessly with your interior.

Modular alarm system

The AK4138’s modular design offers smaller, discreet components that can be hidden in tight spaces, making it harder for thieves to locate or disable the system.

Most alarms give away the immobiliser’s location with clicking relays when triggered. The Cobra avoids this problem by separating modules.

Cobra bus network

With bus network monitoring, if the siren is unplugged or its cable cut, the alarm still activates your other sirens, horn honk, indicators, and pager output.

Even better, if anyone tampers with the system while it’s disarmed, you’ll be warned as soon as you arm it. The system will chirp and the LED will flash a fault code so you know something isn’t right.

Superb immobiliser protection

The AK4138 includes:

1 cut from the main alarm ECU (starter motor)
2 cuts from the modular immobiliser (running circuits)

Want even more security? Add an additional 8509 immobiliser module for another two cuts.

This, and the 8510 are the only immobiliser systems in NZ proven to be totally attack-proof.

Digital battery back-up siren

The Cobra 4310 digital siren is fully waterproof, rugged, and has a battery pack that lasts for years. If that’s not enough, the AK4138 also has:

Dedicated horn honk output
Optional second siren (external or internal screamer)

This means if one sound source is disabled, another still alerts everyone nearby.

Rugged, waterproof remote controls

The AK4138’s remotes are Muppet-proof – simple two-button operation that’s easy to use:

Lock Button:

Arms the alarm
Optional window closure
Double-press to disable ultrasonic sensors (for leaving windows open)
Triple-press to disable microwave or tilt sensors (great for ferries)
After full arm (27 seconds), enables car finder and panic mode

Unlock Button:

Disarms alarm & unlocks doors
Disarms immobiliser after auto-arm

Factory-look ultrasonic sensors

The included ultrasonic sensors are more effective than basic glass break detectors, picking up real movement inside the cabin.

They can be painted to match your interior – the standard grey suits around 90% of vehicles, but black versions are also available for a seamless OEM look.

RRP: $900.00
Insurance Approved: Thatcham Cat 1
Obsessive Rating: 10/10
Looking at some of the alarms that claim to have a 5 star rating to it would only be right to give the AK4138 a 10 Star rating. It simply is that much better then the competition!.