Before you buy
This 2021 Bmw M340i has 8 NHTSA complaints — top issue: Engine Problems.
A model-year pattern isn't the car in front of you. Check this exact VIN for accidents, open recalls, odometer rollback, and salvage titles.
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2021 Bmw M340i Fuel Economy
✓ EPA Official DataEPA-rated fuel economy across 2 2021 Bmw M340i trim configurations. The median figure is shown; range reflects all available trims.
Source: EPA FuelEconomy.gov. Figures reflect EPA lab testing; real-world results vary by driving style, load, and conditions. 2 trims analysed.
Based on NHTSA complaint data, the 2021 Bmw M340i has 8 owner complaints, 0 crash-related complaints, and 6 recall campaigns on record. The most frequently reported component is Engine Problems. NHTSA reliability signal: Good Record.
- Make
- Bmw
- Model
- M340i
- Model year
- 2021
- NHTSA owner complaints
- 8
- Crash-related complaints
- 0
- Safety recall campaigns
- 6
- Top reported component
- Engine Problems
- Reliability signal
- Good Record
- EPA MPG combined
- 26
- EPA MPG city / highway
- 23 / 32
- Fuel type
- Premium Gasoline
Common problems
Most common 2021 Bmw M340i problems
Top owner-reported complaint areas and where they often appear.
Engine Problems
Transmission / Drivetrain
Electrical Faults
Complaint patterns center on Engine Problems, Transmission / Drivetrain, Electrical Faults. Use these as a pre-purchase inspection guide, then verify recall and damage history on the specific VIN.
Buyer verdict
Should you buy a used 2021 Bmw M340i?
This BMW M340I year shows a meaningful number of reported issues, so buyers should only proceed after a careful records review and inspection.
Model-year complaint trends can reveal recurring trouble spots before you spend money on inspections, financing, or repairs.
May Suit
This year may suit buyers who prioritize complete maintenance records and pass a pre-purchase inspection.
May Want to Avoid
Buyers who want a lower-risk ownership profile may prefer comparing nearby model years before committing.
Pre-purchase
What to check before buying a used 2021 Bmw M340i
Inspection Focus
- Inspect the most frequently reported complaint components on this model year
- Confirm recall repairs were completed and documented
- Check for accident damage, title brands, and mileage inconsistencies on the exact VIN
Before You Close the Deal
- Run a VIN check on the specific vehicle you are considering
- Verify all open recalls are completed at nhtsa.gov/recalls
- Request service records for the most-reported complaint components
- Have a certified mechanic inspect the vehicle before purchase
Check the exact car
Shortlist with model-year data. Decide with the exact VIN.
Before buying a used 2021 Bmw M340i, run a VIN history report to verify accidents, title brands, odometer records, theft checks, and open recalls for the exact vehicle.
AI verdict
What the complaint data suggests
Editorial interpretation of NHTSA public complaint data. Source: nhtsa.gov. Complaints are owner-submitted and do not confirm a defect. Methodology
The BMW M340I has 8 NHTSA complaints and 6 recalls on record. This data reflects owner-reported issues submitted to the National Highway Traffic Safety Administration.
Recall context: 6 recall campaigns are on record, so recall completion status should be confirmed on the exact VIN before purchase.
- 8 total complaints filed with NHTSA
- 6 federal recall campaigns
- No crash-related complaints on record
- Review NHTSA complaint history for the most-reported components
- Check recall completion status at nhtsa.gov/recalls
- Verify service records for frequently complained components
Full breakdown
All 2021 Bmw M340i complaints by category
Every owner-reported complaint category filed with NHTSA for the 2021 Bmw M340i. Use this as a pre-purchase inspection checklist.
| Component | Complaints | Crashes | Fires | Avg Mileage | Volume |
|---|---|---|---|---|---|
| Engine Problems | 4 | — | — | — | |
| Transmission / Drivetrain | 3 | — | — | — | |
| Electrical Faults | 1 | — | — | — | |
| Fuel/Propulsion System | 1 | — | — | — | |
| Steering Defects | 1 | — | — | — | |
| Suspension Failures | 1 | — | — | — | |
| Brake System | 1 | — | — | — |
Source: NHTSA Complaints Database. Complaint counts may exceed total complaints because one report can span multiple categories.
In their words
Real owner complaints
Read what owners actually reported to NHTSA for the 2021 Bmw M340i. Type a keyword (e.g. “transmission”, “stalling”, “brakes”) to filter.
Here’s a strong version that sounds frustrated but still credible and harder to dismiss: I’ve owned many vehicles over the years, and this BMW has been, without question, the most problematic car I’ve ever had. The list of issues has been absurd for a vehicle in this price rang…
I am reporting a safety concern with BMW vehicles equipped with the B58 Technical Update (B58TU) engine, primarily in 2019–2021 model years. These vehicles use a variable-displacement oil pump containing an internal thermoplastic adjusting component that regulates oil pressure. T…
I am reporting a safety concern involving BMW vehicles equipped with the B58 Technical Update (B58TU) engine, commonly found in model years 2019–2021. These vehicles utilize a variable-displacement engine oil pump containing an internal thermoplastic adjusting component responsi…
Started as low creaking noise coming from front left wheel. Slow speeds, over small bumps. Over time (one month), creaking noises became louder and more frequent. At that time, steering was starting to feel stiff when turning to the left. Taken to 2 BMW dealerships who said it …
While driving through an intersection and making a left turn, a failure of the engine water pump pulley caused the pulley to break apart. This led to damage to the coolant line and tensioner, sudden coolant loss, and the serpentine belt slipping off. The failure occurred mid-tur…
At approximately 20,000 miles, vehicle indicated excessively low oil. The dealer indicated oil level was excessively low but did not identify the problem,. The vehicle was filled and returned to owner. Within 1000 miles, the incident occurred again. Dealer replaced replaced the…
At approximately 20,000 miles, vehicle indicated excessively low oil. The dealer indicated oil level was excessively low but did not identify the problem,. The vehicle was filled and returned to owner. Within 1000 miles, the incident occurred again. Dealer replaced replaced the…
The contact owns a 2021 BMW M340I. The contact stated while driving various speeds, the vehicle independently shifted from reverse(R) to drive(D) to park(P). The contact stated that while driving approximately 10 MPH and attempting to stop the vehicle, the brake pedal was depress…
Source: NHTSA Complaints Database. Real owner reports for the 2021 Bmw M340i.
Safety recalls
2021 Bmw M340i recalls
6 campaignsNHTSA recall campaigns for the 2021 Bmw M340i. 6 recall campaigns are on record, so recall completion status should be confirmed on the exact VIN before purchase. Recalls are free to fix at authorized dealers, but completion status must be verified on the exact VIN.
SEAT BELTS
ELECTRICAL SYSTEM:12V/24V/48V BATTERY
BACK OVER PREVENTION: SENSING SYSTEM: CAMERA
SEAT BELTS:FRONT:BUCKLE ASSEMBLY
SEATS
SEAT BELTS
Research more
Keep researching before you buy
Compare brands and categories, then check the exact car's history by VIN.
Questions
2021 Bmw M340i buying FAQ
Buyer-focused answers based on real NHTSA complaint and recall data for this model year.
Is the 2021 Bmw M340i reliable?▾
Good Record. NHTSA currently shows 8 owner complaints, 0 crash-related complaints, and 6 recall campaigns for this model year. This BMW M340I year shows a meaningful number of reported issues, so buyers should only proceed after a careful records review and inspection. Treat this as a model-year signal, then verify the exact vehicle's condition and history before purchase.
What are the most common problems with the 2021 Bmw M340i?▾
#1: Engine Problems (4 complaints). #2: Transmission / Drivetrain (3 complaints). #3: Electrical Faults (1 complaints)
At what mileage do problems start on the 2021 Bmw M340i?▾
Mileage data is not available or insufficient for this model year.
How safe is the 2021 Bmw M340i?▾
Complaint data is not the same as crash-test scoring, but it does highlight possible risk patterns. For the 2021 Bmw M340i, NHTSA complaints include 0 crash-related reports and 0 fire reports out of 8 total complaints. For controlled crash-test ratings, check nhtsa.gov/ratings.
Does the 2021 Bmw M340i have any recalls?▾
Yes. 6 NHTSA recall campaigns affect the 2021 Bmw M340i. A major recall area is SEAT BELTS. 6 recall campaigns are on record, so recall completion status should be confirmed on the exact VIN before purchase. Always verify open recalls by VIN because completion status varies by vehicle.
Should I buy a 2021 Bmw M340i?▾
This BMW M340I year shows a meaningful number of reported issues, so buyers should only proceed after a careful records review and inspection. Model-year complaint trends can reveal recurring trouble spots before you spend money on inspections, financing, or repairs. Pay extra attention to Engine Problems during inspection. Before committing, run a VIN history report to verify accidents, title brands, odometer records, and recall completion for the exact car.
Source: NHTSA (National Highway Traffic Safety Administration) complaint and recall databases, aggregated by VinSpectorAI.
Wider context: See the full Bmw M340i reliability report with year-by-year comparison.
Owner Reliability Rating
Rate the 2021 Bmw M340i based on your ownership experience.
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Ratings are based on owner experience and are separate from NHTSA data shown above.
Before you buy
Check the exact vehicle history before you buy
Model-year complaints and recalls reveal patterns. A VIN report confirms whether the exact car has accident history, title brands, mileage issues, or open recalls.