Seat Belt Assembly Issues

Multiple recalls have targeted seat belt components, including buckle assemblies and retractors. These issues can range from warning light malfunctions to potential failures in restraint function. Estimated repair cost: $200 - $600.

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2021 BMW M340i Maintenance guide

Name: Maintenance dataset for 2021 BMW M340i
Creator: Carfocal

v1.0Updated Jun 4, 2026Ryan Davis4 Sources Analyzed

MAINTENANCE SUMMARY

The 2021 BMW M340i, with an average reliability verdict, requires diligent maintenance. Focus on the seat belt assemblies and 48V battery connection due to multiple recalls; ensure these are inspected and properly repaired.

View Critical Issue: 48V Battery Connection Faults

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Reliability Score

Est. Annual Maintenance Cost

$500 - $800

TSBs & Recalls

0 TSBs | 10 Recalls

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Key Takeaways

Proactive inspection of seat belt assemblies is advised due to multiple recall campaigns.
Verify the 48V battery connection recall has been properly addressed.

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Critical service intervals

Common failure analysis

Symptoms and prevention guidance