They make it pretty difficult to do it cheaper but there's ways. You may be able to find the key for less on eBay and yes you can find and but factory original keys on their. Then have the dealer program it. It also depends on the year, and model but there are tons of videos on you tube on how to program factory keys. It's not as hard as they lead you to believe.
They will need to reprogram the spare key too, just in case someone finds your lost key.
Not.. they need to do sync your car with ur new key, $150 sync and 350 for the key at the mercedes dealer
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