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Q: Alarm and automatic lock on 2000 Mercedes-Benz E430

The alarm goes off randomly and the automatic locks and unlocks while driving how do I fix this problem?
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It sounds like there is a short in your alarm system. You should take it to the dealer or a reputable car shop to fix the problem. This could be a costly venture and, if it is in fact your alarm system being faulty, you can remove the alarm's chip to make it inactive.
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