The 3rd generation Subaru Impreza was released in 2007. It addressed most of the security vulnerabilities of the previous generation car.
All models now come with a factory immobiliser and the pillar-less windows are gone. Some models even have a basic alarm.
It’s worth noting that Subaru did not offer an immobiliser on any model until March 2003. Even then this only applied to models sold in New Zealand. More details of which can be found here…
Subaru Impreza Security
The CAN-BUS system on the Impreza is interesting as locking and unlocking it with the switch on the driver’s door generates the same data as a remote lock/unlock.
This is a problem for most aftermarket CAN-BUS alarms as they can be tricked into arming/disarming, which is also an issue with most Nissan’s and some Mazda’s as explained here…
The good news is that the Cobra AK4615 has this covered so has a switch inhibit built into the alarm to prevent the vulnerability. Whereas nearly every other brand of alarm I’ve looked at is compromised by this so be warned!
The Cobra AK4615 in action on the Impreza:
Some photos of the details:
I recommend an ADR card for models with the smart key and push to start to protect against key cloning.
How to change the Remote Battery on the Smart Key
First, remove the key blade section of the remote, then use a small flat blade screwdriver and prize open as shown in the photo below.
Inside you’ll find a CR1632 battery.
Gen 2 Impreza Security
Own a Gen 2 Impreza made after March 2003? If so the Cobra AK4615 can be made to work in PLIP configuration from the factory remote.
Should you have a Jap import or an older model including the Gen 1, then I’d suggest an insurance standard immobiliser as a minimum level of protection.