The service and repair manual for the 2021 BMW M340i — the 3.0L I6 engine, 1 trim. Matched to this exact model year, so the specifications and sequences are the ones BMW published for your car, not figures carried over from a neighbouring year.
01 / FitmentWhat this manual covers
| Model year | 2021 |
|---|---|
| Engines | 3.0L I6 — 183 cu in, DOHC, turbocharged |
| Trims | Base Sedan 4-Door |
| Other 2021 M340i variants | M340i xDrive → |
| Federal record | 5 recalls · 12 complaints · 183 technical service bulletins (refreshed 2026-08-21) |
02 / InsideSample pages from the 2021 M340i manual
03 / ContentsSections in the manual
- Quick Lookups 55
- General Information 2,483
- Accessories & Equipment 4,321
- Heating, Ventilation & A/C (HVAC) 356
- Body & Frame 2,467
- Hybrid/Electric Powertrain 661
- Brakes 163
- Maintenance 32
- Collision 1,084
- Restraints 147
- Drivelines & Axles 666
- Steering 399
- Electrical 2,173
- Suspension 674
- Engine Mechanical 3,136
- Transmission 266
- Engine Performance 1,853
04 / Known issuesRecalls on federal record for the 2021 M340i
- Seats · 23V211000An improperly welded seat frame may not properly restrain the occupant during a crash, increasing th.
- Seat Belts — front › buckle assembly · 21V298000An improperly installed seat belt assembly may not restrain an occupant as expected, increasing the.
- Seat Belts · 21V554000During a crash, a seat belt retractor that does not function as intended increases the risk of injur.
- Back Over Prevention — sensing system › camera · 21V096000If the driver relies on only the rearview camera image, the missing or reduced rearview image view c.
- Seat Belts · 23V584000An audible chime that does not properly alert the driver to fasten their seat belt increases the ris.
Owners have filed 12 complaints and BMW has issued 183 technical service bulletins for the 2021 M340i. The manual carries the manufacturer's diagnostic and repair procedures behind these systems.
FAQQuestions about the 2021 M340i manual
Is this manual specific to the 2021 M340i?
Yes. It is the OEM manual matched to the 2021 model year, covering the 3.0L I6 across the Base Sedan 4-Door trims. Specifications and procedure sequences are the ones BMW published for this year.
What 2021 M340i problems does it help with?
5 recalls are on federal record for the 2021 M340i, covering seats, seat belts, back over prevention. The manual carries the manufacturer's diagnostic and repair procedures for those systems; the recall repairs themselves are done free by BMW dealers.
Does it include 2021 M340i wiring diagrams?
Yes — the complete wiring diagrams for the 2021 build, alongside repair procedures, specifications and diagnostics.
Is it a subscription?
No. $40.99 once and the manual is yours. It is a digital manual — nothing ships; access details arrive by email after checkout and it works on any device.
RelatedOther M340i years and 2021 BMW models
2024 M340i · 2023 M340i · 2022 M340i · 2020 M340i · all 5 years
2021 BMW 118i · 2021 BMW 120i · 2021 BMW 220i · 2021 BMW 228i Gran Coupe · 2021 BMW 228i xDrive Gran Coupe · 2021 BMW 230i · 2021 BMW 230i xDrive · 2021 BMW 320i · 2021 BMW 330e · 2021 BMW 330e xDrive · 2021 BMW 330i · 2021 BMW 330i xDrive · every 2021 model