2020-2021 SEAT Mii Problems: 1 Issue Every Owner Should Know
2020-2021 model years · NHTSA recalls, manufacturer TSBs, and owner forum reports · Updated June 2026
According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2020-2021 SEAT Mii has 1 documented known issues. No issues are rated critical, indicating generally reliable ownership. Across all issues, repair costs range from $ to $350. DIY maintenance guides at au7o.io.
All 1 Known Issues
On the 2020-2021 SEAT Mii Electric, the Mii Electric (and twin VW e-Up, Skoda Citigo-e iV) suffers from 12V auxiliary battery drain during long parking, documented in owner forums but not subject to a formal VW Group recall for this specific issue. A separate HV battery cell recall did affect a small number of these cars (213 globally) over fire risk — distinct from the 12V issue. The 12V drain is the more common complaint.
Common Symptoms
- will not wake
- will not charge
- dead 12V
How to Fix
Update vehicle software (dealer; some markets covered by recall). Use a 12V battery maintainer for parked stretches over 1 week. AGM 12V replacement €120-€200 + €50-€100 coding.