2021 BMW M340i Maintenance guide
v1.0Updated Ryan Davis4 Sources Analyzed
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.
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
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MethodologyHow we score →
Scores are derived from NHTSA recalls and owner complaints, normalized by vehicle segment averages.
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