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Message: <blockquote data-quote="jaleeks23" data-source="post: 564758" data-attributes="member: 8431">Suggest to check drainage at the engine bay, ECU area, underneath the aircon filter. I had this problem before for my E39, left rear footwell wet. Drainage blocked, so somehow water went into passenger cabin. Another problem is windscreen. Another problem is if the aircon filter box been removed, check if installed overlapping correctly.How I test1) lift up carpet2) close everything and spray water onto windscreen (can see water flow to rear footwell, then bring to mech to check and found drainage block due to dried leaves and all the dirt)</blockquote>