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In my wife's 2008 (RIP) I think water was entering the compartment under the carpet below the taillight somewhere along the frame rail and getting in the styrofoam holder for the TPM control. I never found a spot but I did drill holes in all the compartments in the styrofoam and then used one of the plastic plugs in the bottom of the body to insert a tube to vent any water. Never had another issue with it. I don't see the same issue in my 2013 but it would be just like BMW to never have fixed the problem.
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