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BMW keys use what is called an EWS chip. These chips are built into every key, even spares and plastic wallet keys. They can only be obtained from BMW. Each car can only have 10 keys. If all 10 are lost, the entire ignition system must be replaced for a new chip set.

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Q: Lost key to a 2004 BMW 525i do you have to purchase a key from BMW dealer what if the locksmith made a key using proper key code?
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