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To start with, since it only seems to happen near your own house, daft as it may seem, you should check for any radio interference sources, such as your wireless router for the internet or maybe you have a cordless handset for your telephone.
Switch them off one at a time and check whether the locking works as it should. Then you'll know.

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There can be few causes for that but i doubt that the problem is with the BCU itself, the issues are covered in the following bulletin: http://landroverclubvi.weebly.com/u...odule_troubleshooting_and_upgrade8610nasf.pdf just read 433Mhz instead of 315 the rest is all the same

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