What breaks most · 2020 to 2022 model years
BMW M340i problems by year
Owners have filed 69 safety complaints with NHTSA about the BMW M340i across model years 2020 to 2022. Three years stand out: 2020 for engine complaints, 2021 for engine complaints and 2022 for suspension complaints.
- Years to check closely: 2020, 2021, 2022
- Complaints on file
- 692020 to 2022, all trims
- Worst year
- 202052 complaints
- Crashes reported
- 00 fires · 0 injuries · 0 deaths
- Typical failure mileage
- 28kMedian where owners gave mileage
- Recall campaigns
- 17Across the years shown
Complaints by model year
Raw filings with NHTSA, not adjusted for how many were sold.
| Model year | Complaints | Crashes | Recalls | Most-reported component |
|---|---|---|---|---|
| 52 | 0 | 10 | Engine (37) | |
| 11 | 0 | 6 | Engine (7) | |
| 6 | 0 | 1 | Suspension (1) |
What fails on the 2020 BMW M340i
| Component | Share of complaints | Filings | Crashes | Parts for this job |
|---|---|---|---|---|
| EngineEngine gaskets and seals | 71% |
37 | 0 | Shop engine parts for the 2020 BMW M340i |
| Unknown or other | 17% |
9 | 0 | — |
| Electrical systemAlternators, starters and ignition | 12% |
6 | 0 | Shop electrical system parts for the 2020 BMW M340i |
| Engine and coolingRadiators, thermostats and cooling | 8% |
4 | 0 | Shop engine and cooling parts for the 2020 BMW M340i |
| Fuel systemFuel pumps and injectors | 6% |
3 | 0 | Shop fuel system parts for the 2020 BMW M340i |
| Powertrain and transmissionTransmission parts | 4% |
2 | 0 | Shop all powertrain and transmission parts, not filtered to this vehicle |
| Tires | 4% |
2 | 0 | — |
| Wheels | 2% |
1 | 0 | — |
One complaint can name more than one component, so shares add to more than 100%. "Unknown or other" is NHTSA's uncategorized bucket and is shown but never ranked.
In owners' words
Complaint narratives as filed with NHTSA, trimmed for length.
-
Exhibiting signs of not being able to read oil levels which is a potential sign of oil pump failure due to plastic internal components that has occured in 2020 models.
-
The brakes failed at high speed. Yes the vehicle is available for inspection. The car hit a barrier and flipped on its roof. Yes, I and my passenger were both at risk of serious injury. No independent confirmation has taken place at this time. No warning lights indicated malfunction.
How to read this page
Every figure comes from the National Highway Traffic Safety Administration's public complaint database, which holds every safety-related defect complaint filed by owners since 1995. We refresh it monthly and count each complaint once per component it names. Data through September 6, 2026.
NHTSA only accepts safety-related complaints. Rattles, paint, infotainment bugs and other annoyances are under-reported here, so this page is a map of what fails in ways owners consider dangerous, not a full reliability score.
Counts are raw. Use the year-over-year shape and the component mix, not the absolute numbers. Where a component maps to parts we stock, the row links to that category filtered to the year you are viewing. Air bag and seat belt complaints link to the recall checker instead, because those repairs are almost always covered.
Common questions
Which BMW M340i years have the most problems?
By NHTSA complaint volume, 2020, 2021, 2022 carry the most filings on the BMW M340i. The 2020 alone has 52 complaints, led by engine.
What is the most common BMW M340i problem?
On the 2020 model year, the most-reported component is engine with 37 complaints. The table above lists the top components for every year.
At what mileage do BMW M340i problems start?
The median mileage at failure across all BMW M340i complaints that include mileage is about 28,000 miles. Older model years skew higher; the per-year figure is in the "at a glance" card.
Are these complaints verified?
No. NHTSA publishes complaints as submitted and does not investigate individual filings. Patterns across hundreds of complaints are meaningful; a single one is not.