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Ls400 Mk Iv Alarm Plays Up

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Once in a blue moon the alarm (sound and flashers) on my 98 Mk IV goes off with no apparent reason. I turn it off and then it does it again a couple more times and I have found that if instead of pressing the fob once (car flashes once) I press it twice (four flashes) this seems to settle it down. It locks properly and both the car and fob batteries are relatively new (end of last year). Any ideas and does anyone know what is the difference between pressing the fob button once and twice?

Many thanks.

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