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Mine too used to lock by itself. Once it did it with the keys laying on the front seat. Then the fuse blew. I disconnected the battery, replaced the fuse No 63, connected the battery and replaced the battery in the key. All seems fine at the moment but on occasions when driving along I some-times hear the C/locking motor trying to lock the doors but doesn't,(if that makes any sense). Any ideas what this could be?