I found a similar leak in my Insight to be from an unplugged opening under the left wheel arch passing into the passenger compartment for the wiring from the Honda Malaysia factory fitted Cobra immobizer. A rubber plug is provided with the original wiring but the installer did not set it in place allowing water run-off from the windscreen to flow down and through the unplugged opening into the passenger compartment. This has been confirmed by pouring water on the windscreen and observing the flow of water down the wheel arch. The opening can be seen under the left front wheel arch (towards the rear) after removing the wheel arch stone guard. The leak stopped after the rubber plug was reset in place. Hope this solves your water leak also.

Can be DIY. Just need to remove the press studs retaining the stone guard under the wheel arch and press the Cobra wiring rubber plug back in place. Will try to post some pics when I have time to dismantle mine for some pics. Remove any additional carpet mats as original carpet needs to be lifted up to dry properly due to the thick sound proofing padding on the under side which will probably be soaked. Good luck !

Will try to post some pics when I have time to dismantle the stone guard under the wheel arch again to snap some pics.

Did you confirm whether your SC re-plugged the correct opening? Other sources for leaks on the left side would be the entry points through the engine compartment firewall into the passenger compartment for airconditioning piping and wiring harnesses (including the orange coloured IMA cabling). Water leaks through these are less likely as they are shielded from direct water entry by the windscreen wiper/air intake compartment below the windscreen (unless you have driven like a rally driver through flooded areas ).

However, it may be useful to check if additional wiring was passed through these other points by installers of other aftermarket electrical/electronic equipment (e.g. Cobra Connex GPS aerial wiring etc.) which were not properly re-sealed

If your SC had plugged the correct opening and there are no other leaks then your carpet is probably still damp as the thick insulation material below the original carpet is soaked and will take some time to dry. Try removing the plastic panels at the door sill and foot well and lift the carpet up to air and dry properly to remove the damp smell.

I am waiting for mine to dry to confirm if it still smells damp. Otherwise will claim new carpet from Honda Malaysia !!