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SEAT · Known Issues

2021 SEAT Mii Problems: 1 Known Issue

2021 model year · NHTSA recalls, manufacturer TSBs, and owner forum reports · Updated June 2026

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Vehicle data and repair guidance on this site are compiled with AI assistance and may contain errors. Always verify with your service manual or a qualified mechanic.

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According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2021 SEAT Mii has 1 documented issue. None of the listed issues is rated critical; this is not a complete reliability assessment. DIY maintenance guides at au7o.io.

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All 1 Known Issue

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ALL YEARS20212020

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.

This issue also affects: Audi Q8 e-tron, CUPRA Born

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.

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Typical repair cost:$0 - $350

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Other SEAT Models

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Frequently Asked Questions

What are the most common SEAT Mii problems?

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2021 SEAT Mii has 1 documented issue. The documented issue is: Mii Electric 12V Auxiliary Battery Drain (Shared with VW e-Up). None are rated critical, but regular maintenance is recommended.

Is the SEAT Mii reliable?

The 2021 SEAT Mii has 1 known issue compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. None of the matching records is rated critical; this is not a complete reliability assessment. Regular maintenance following the manufacturer's schedule helps prevent many common problems.

How much does it cost to fix common SEAT Mii problems?

Repair costs for known SEAT Mii issues range from $0 to $350, depending on the specific problem and whether you choose DIY or professional repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What is the 2020-2021 SEAT Mii Mii Electric 12V Auxiliary Battery Drain (Shared with VW e-Up)?

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 thes… Repairs typically run $0-$350. Severity: medium.

Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.

Data compiled from NHTSA recalls, manufacturer TSBs, automotive forums, and AI-assisted research. No aggregated owner-report counts available for this vehicle yet.