The VX220 is fitted as standard with a modified version of the Meta M99T2 alarm (a very reliable and secure unit). The version fitted to the VX has different firmware especially developed for Vauxhall, it's these units that have the problem, the standard M99T2 is immune to this type of radio interference.
The easiest way around this problem is to replace the VX alarm with a standard Meta unit, which is a simple plug and play. I can supply a complete unit with two remote fobs and codecard. For more info or to buy click here
To replace, locate the alarm unit hidden under the dash on the passenger side (remove the stereo, prise away the chrome trim and remove fixing screws to access the unit under the dash top).
Also I've noticed that Vauxhall charge £240 for a replacement siren, I have the very same for £65 plus P&P. I can also supply replacement remote fobs but you need the 16 digit number found on the codecard.
Thanks for looking Regards Sam
Edited by techieboy, 21 September 2010 - 10:43 PM.