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If you lost your key, and you have no other keys. You will need to contact a Mobile locksmith to open your car. Once he opens it, the battery may need to be disconnected. Once disconnected, one of the lock cylinders would need to be removed so the locksmith can decode it. Once he decodes it and makes a key. The key will then need to be programmed to the vehicle, which the mobile locksmith can do as well.
That is what will need to be done.
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