The frequency of a remote control is critical to its working ability with a vehicle.

Vehicles such as the Holden Astra and Vectra range require a specific frequency range per vehicle.

The best way to test the frequency is by checking any existing keys with the AD35 remote frequency tester. Saying that, frequency band width alone is not a single sure way to determine if a remote can be programmed into a vehicle. The radio band is simply used to transmit data to and from the vehicle, which data is transmitted and the data composition is governed by other technologies. A perfect example is again the Holden Astra and Vectra which have identical frequencies and appearance, but can certainly not interchange.