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Frequency setting?

It appears as if frequency of my Car Security System is disturbed, The remote of alarm system is not functioning, I have cahnged the batteries as well
Tahir, December 2009
The key needs to be re synchronised to the car. The method used depends on the make/model/year of car, which you have not given.
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(Add all the detail you can. Include the item's name, make and model details. The more detail you add the more likely it is that others will be able to help you.)

fred, December 2009