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Water Leaks, Sunroofs & SealsQuestionCommunity Starter

2023 BMW M340i — footwell gets wet only after heavy rain

CleanNomad410Community StarterMay 27, 20262023 BMW M340i xDriveRaleigh
2023 BMW M340i xDrive, about 63,500 miles. The car stays dry in normal rain but after a long storm one front footwell gets damp. Door seal looks okay. What drain/seam tests would you do before tearing the interior apart?
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10 replies

UsedCarBuilder830Community StarterCommunity StarterMay 27, 2026permalink
Don't overfit one forum story to your car. If it still isn't clear on the 2023 BMW M340i, a specialist hour can be cheaper than another round of parts. I'd do that before spending real money. This is from a 2023 BMW M340i in Raleigh with 63,500 miles. I'd want a dollar figure or a measured spec, not 'should be fine.' I'm keeping receipts and dates in one folder.
V8Fan67Community StarterCommunity StarterMay 27, 2026permalink
I'd keep this practical. Verify the cheap/easy branch on the 2023 BMW M340i before a big repair or a big spend. That's where I'd start. If they can't show the line item, I assume it's hiding. This is me being the wet blanket on purpose.
WrenchPilot142Community StarterCommunity StarterMay 28, 2026permalink
I'd push back a little: If it still isn't clear on the 2023 BMW M340i, a specialist hour can be cheaper than another round of parts. I'd do that before spending real money. Time, temperature, and whether it's in gear are the notes that actually help a shop. A day of patience here is cheaper than a wrong part. I'm keeping receipts and dates in one folder.
CityMom778Community StarterCommunity StarterMay 28, 2026permalink
I'd push back a little: Verify the cheap/easy branch on the 2023 BMW M340i before a big repair or a big spend. I'd do that before spending real money. This is from a 2023 BMW M340i in Raleigh with 63,500 miles. Do that first. I'll update if anything new shows up.
WrenchPilot142Community StarterCommunity StarterMay 27, 2026permalink
Write down what you already tried. A second data point from another 2023 BMW M340i owner helps more than a generic diagnosis. I'd do that before spending real money. Write the result down so the next test isn't a repeat of the last one. If this is nothing, great. I want that in data.
DealGeek577Community StarterCommunity StarterMay 28, 2026permalink
I'd keep this practical. Verify the cheap/easy branch on the 2023 BMW M340i before a big repair or a big spend. Then you'll know the next fork. Learned this the expensive way on a previous car. I've seen both outcomes, which is why I'd test instead of assume. This is me being the wet blanket on purpose.
BoostMechanicish509Community StarterCommunity StarterMay 28, 2026permalink
Write down what you already tried. A second data point from another 2023 BMW M340i owner helps more than a generic diagnosis. That's where I'd start. Post the numbers (or the code) and people can get more specific. I'd sleep better after that step, even if it finds nothing. Might be overthinking it, but I'd rather overthink than overspend.
WeekendDriver470Community StarterCommunity StarterMay 28, 2026permalink
Write down what you already tried. A second data point from another 2023 BMW M340i owner helps more than a generic diagnosis. I'd do that before spending real money. That's the sequence I'd use. This is the version I'd tell a friend.
WeekendWeekend261Community StarterCommunity StarterMay 28, 2026permalink
Don't overfit one forum story to your car. If it still isn't clear on the 2023 BMW M340i, a specialist hour can be cheaper than another round of parts. Then you'll know the next fork. If you share a photo of the worksheet, easier to sanity-check. I'm keeping receipts and dates in one folder.
CleanNomad410Community StarterCommunity StarterMay 28, 2026permalink
Useful. I'll report back after I verify that on my 2023 BMW M340i. I'd rather look cautious in this thread than stuck later.
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