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Alarms & upgrades


Thatcham guide

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Thatcham: has divided car alarms into 2 separate categories:

  • Category 1 - Combined alarm and immobiliser
  • Category 2-1 - Alarm upgrades

    • Category 1 - Combined alarm and immobiliser

    These have the following features:

    Alarm:

  • Will go off if a thief enters the vehicle or opens a doors/boot/bonnet
  • Switched on automatically when you leave the car (or you don't have to actively turn it on)
  • Has its own battery for the siren and will sounds even if the main battery is disconnected

    • Immobiliser:

  • Operates separately to the main system in your car (acts as a backup)
  • Has a defence against easily copying the code that allows you to start your car

    • Category 2-1 - Alarm upgrades

    These have the same features as above, except:

  • An alarm is added to an existing Category 2 immobiliser on its own to make it a Category 1 system (a bit counter intuitive, but Category 1 is higher than 2)
  • If you only had an immobiliser fitted on your car on its own, and added a Thatcham approved alarm to it - the combined system would be Category 1


    • Approved products

    See our alarms supplier section for both Thatcham Category 1 alarms & immobilisers and Category 2-1 alarm upgrades.

    Reviews & ratings

    See our reviews and ratings section for other car owner's views.

    Forum

    If you want to see what our other users are saying and to discuss any issues you have related to car security, check our forum.