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2018 Honda Civic — footwell gets wet only after heavy rain — anyone dealt with this recently?

CityCamper695Community StarterNov 22, 20252018 Honda Civic SiNew Jersey
2018 Honda Civic Si, about 139,000 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? Interested in real owner experience more than guesses. What would you check next?
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21 replies

V8Fan67Community StarterCommunity StarterNov 22, 2025permalink
I'd keep this practical. Verify the cheap/easy branch on the 2018 Honda Civic before a big repair or a big spend. Then you'll know the next fork. This is from a 2018 Honda Civic in New Jersey with 139,000 miles. I'd want that in writing, not as a promise. I'll update if anything new shows up.
CanyonGarageCommunity StarterCommunity StarterNov 23, 2025permalink
Same neighborhood, different next step: A second data point from another 2018 Honda Civic owner helps more than a generic diagnosis. Then you'll know the next fork. That's the sequence I'd use. If this is nothing, great. I want that in data.
GarageGal671Community StarterCommunity StarterNov 22, 2025permalink
Write down what you already tried. A second data point from another 2018 Honda Civic owner helps more than a generic diagnosis. Then you'll know the next fork. This is from a 2018 Honda Civic in New Jersey with 139,000 miles. Had a similar mess a couple years ago and that's what finally sorted it. This is the version I'd tell a friend.
CityCamper695Community StarterCommunity StarterNov 22, 2025permalink
I parked the 2018 Honda Civic and wrote down what I already tested so I'm not repeating myself. If the story changes I'll post the new data.
ShiftMom825Community StarterCommunity StarterNov 22, 2025permalink
Write down what you already tried. A second data point from another 2018 Honda Civic owner helps more than a generic diagnosis. That's where I'd start. If you share a photo of the worksheet, easier to sanity-check. This is the version I'd tell a friend.
DieselNomadCommunity StarterCommunity StarterNov 22, 2025permalink
Don't overfit one forum story to your car. If it still isn't clear on the 2018 Honda Civic, a specialist hour can be cheaper than another round of parts. I'd do that before spending real money. Do that first. That's coming from doing this as an owner, not a shop. I'm in no rush to be a hero on it.
CanyonGarageCommunity StarterCommunity StarterNov 22, 2025permalink
Owner notes beat generic advice here. On the 2018 Honda Civic in New Jersey, I'd fix the thing you'll notice every day before chasing spec-sheet extras. Then you'll know the next fork. On “footwell gets wet only after heavy rain,” that was the fork that mattered for me. That's the sequence I'd use. Wrote this up on my lunch break.
ShiftMom825Community StarterCommunity StarterNov 23, 2025permalink
Quick add on that: A second data point from another 2018 Honda Civic owner helps more than a generic diagnosis. That's where I'd start. Happy to compare notes if your setup is different. Might be overthinking it, but I'd rather overthink than overspend.
ShopBuilder989Community StarterCommunity StarterNov 24, 2025permalink
Not convinced that's the whole story. Verify the cheap/easy branch on the 2018 Honda Civic before a big repair or a big spend. Then you'll know the next fork. I'd want that in writing, not as a promise. This is me being the wet blanket on purpose.
CityCamper695Community StarterCommunity StarterNov 22, 2025permalink
Thanks — that narrowed it. I'm going to try the simpler check on the 2018 Honda Civic first. I'm in no rush to be a hero on it.
DieselNomadCommunity StarterCommunity StarterNov 22, 2025permalink
Owner notes beat generic advice here. On the 2018 Honda Civic in New Jersey, I'd fix the thing you'll notice every day before chasing spec-sheet extras. I'd do that before spending real money. On “footwell gets wet only after heavy rain,” that was the fork that mattered for me. Do that first. Climate here is different, so treat that as a local data point. That's my plan before I call anyone.
HighwayWrench230Community StarterCommunity StarterNov 22, 2025permalink
Owner notes beat generic advice here. On the 2018 Honda Civic in New Jersey, I'd fix the thing you'll notice every day before chasing spec-sheet extras. Then you'll know the next fork. On “footwell gets wet only after heavy rain,” that was the fork that mattered for me. Run the total, not the monthly, before you commit. Climate here is different, so treat that as a local data point. I'd rather look cautious in this thread than stuck later.
CityCamper695Community StarterCommunity StarterNov 23, 2025permalink
Following up on footwell gets wet only after heavy rain: still happening, but I have better notes now. I'd rather look cautious in this thread than stuck later.
CanyonGarageCommunity StarterCommunity StarterNov 23, 2025permalink
I'd keep this practical. Verify the cheap/easy branch on the 2018 Honda Civic before a big repair or a big spend. That's where I'd start. No need to make it theatrical. This is me being the wet blanket on purpose.
CityCamper695Community StarterCommunity StarterNov 24, 2025permalink
Useful. I'll report back after I verify that on my 2018 Honda Civic. I'll update if anything new shows up.
ShiftMom825Community StarterCommunity StarterNov 23, 2025permalink
I'd keep this practical. Verify the cheap/easy branch on the 2018 Honda Civic before a big repair or a big spend. I'd do that before spending real money. Post the numbers (or the code) and people can get more specific. This is me being the wet blanket on purpose.
GarageNomad373Community StarterCommunity StarterNov 23, 2025permalink
I'd keep this practical. Verify the cheap/easy branch on the 2018 Honda Civic before a big repair or a big spend. I'd do that before spending real money. I'd want a dollar figure or a measured spec, not 'should be fine.' Worth doing even if the car feels fine right now. This is me being the wet blanket on purpose.
WeekendGarageCommunity StarterCommunity StarterNov 23, 2025permalink
Don't overfit one forum story to your car. If it still isn't clear on the 2018 Honda Civic, a specialist hour can be cheaper than another round of parts. I'd do that before spending real money. This is from a 2018 Honda Civic in New Jersey with 139,000 miles. I'd want that in writing, not as a promise. I'm in no rush to be a hero on it.
GarageGal671Community StarterCommunity StarterNov 23, 2025permalink
Write down what you already tried. A second data point from another 2018 Honda Civic owner helps more than a generic diagnosis. Then you'll know the next fork. This is from a 2018 Honda Civic in New Jersey with 139,000 miles. Had a similar mess a couple years ago and that's what finally sorted it. I'd sleep better after that step, even if it finds nothing. Might be overthinking it, but I'd rather overthink than overspend.
V8Fan67Community StarterCommunity StarterNov 23, 2025permalink
Owner notes beat generic advice here. On the 2018 Honda Civic in New Jersey, I'd fix the thing you'll notice every day before chasing spec-sheet extras. I'd do that before spending real money. On “footwell gets wet only after heavy rain,” that was the fork that mattered for me. This is from a 2018 Honda Civic in New Jersey with 139,000 miles. I'd want that in writing, not as a promise. This is the filter I use when the thread starts repeating itself. Wrote this up on my lunch break.
CityCamper695Community StarterCommunity StarterNov 23, 2025permalink
I parked the 2018 Honda Civic and wrote down what I already tested so I'm not repeating myself. If this is nothing, great. I want that in data.
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