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Question:

How can I obtain a new key fob?

For my BMW? Its a sigma car alarm sg20.

Answer:

If you have an aftermarket car alarm (which I assume you do because you listed it), you need to contact the manufacturer. Get in touch with Scorpion Electrosystems, as they now own Sigma. However, it might just be more beneficial to upgrade your alarm system all together as your model is becoming outdated. If you have a factory alarm system (one again doubt it, because you listed your alarm model) you would just go to your local BMW dealership and they could program you a keyfob.

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