How do I troubleshoot water leaking into my Audi A1's passenger footwell?

My carpet on the passenger side front seat was wet after heavy rainfall. What could be causing this and how can I fix it?

This is a common issue in Audi A1 cars. The most likely cause is a clogged sunroof drain tube. You can check and unclog it by removing the A-pillar trim and using a small, flexible tool like a pipe cleaner.

Water may also be getting in through faulty door seals. Check for any gaps or cracks and replace them if necessary. You can also use a silicone sealant to fill any gaps and prevent further leakage.

In some cases, the air conditioning drainage system may be blocked, causing water to accumulate and leak into the footwell. Check and clean the drainage tubes to resolve this issue.