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Q: How can I regain use of the infrared remote door lock system? on 1997 Mercedes-Benz E420

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My infrared remote door locks are not working with any of the sensors (batteries are not the issue). The plastic cover on the door unit has crumbled and gone away. I know the dealer is very proud of this door unit! Can I just replace the sensor in the trunk lid and gain access that way?.. or must I adresss the door unit as well? Thanks..
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