2018 Bmw 340I problems and owner complaints
Explore the records behind recurring owner reports.
Key facts
3 owner complaints analyzed
1 distinct recall campaigns
20,000 mi median reported failure mileage
Scope: 2018 model year. Data updated: . 1 complaints include usable failure mileage. View data status.
This selection has limited data. It remains available for lookup but is excluded from search indexing.
Most common problems
Engine is the most frequently named component, appearing in 2 of 3 complaints (66.7%). A complaint can name multiple components.
| Topic | Matching reports | Share of complaints |
|---|---|---|
| Fuel system concerns | 1 | 33.3% |
Topic matches use published keyword rules. They describe mentions, including negations or comparisons, and do not confirm a diagnosis. Read the matching rules.
Component breakdown
Number of unique complaints naming each component. Top eight shown.
| Category | Count |
|---|---|
| Engine | 2 |
| Fuel/Propulsion System | 1 |
Engine: 2; Fuel/Propulsion System: 1
Reported problems by failure mileage
Complaint counts in mileage bands. These are not failure rates per vehicle or mile.
| Category | Count |
|---|---|
| Under 25,000 | 1 |
| 25,000 to 49,999 | 0 |
| 50,000 to 74,999 | 0 |
| 75,000 to 99,999 | 0 |
| 100,000 to 149,999 | 0 |
| 150,000 and above | 0 |
Under 25,000: 1; 25,000 to 49,999: 0; 50,000 to 74,999: 0; 75,000 to 99,999: 0; 100,000 to 149,999: 0; 150,000 and above: 0
Under 25,000 miles has the most reports with usable mileage (1). 2 complaints have missing, zero or invalid mileage.
Complaints over time
Year the complaint was filed, not the vehicle model year or incident year. The snapshot year is partial.
| Category | Count |
|---|---|
| 2021 | 1 |
| 2023 | 2 |
2021: 1; 2023: 2
Pattern summary
Engine leads the component reports. Fuel system concerns appears in 1 complaint narratives. Use these patterns to inspect individual reports and prepare questions for a mechanic.
Calculated from recorded counts. An AI narrative has not been published for this selection.
Complaint evidence
Examples provide context, not a representative sample or a verified diagnosis.
Owner report 11518472 · 2023-04-22 (April 22, 2023)
Fuel Tank Filler Hose Collapse - unable to refuel and vehicle remains stranded.
Owner-reported narrative. Look up ODI 11518472 at NHTSA ↗
Vehicle analysis explorer
Inspect model-year patterns, reported mileage, monthly activity and the evidence behind each signal.
Data completeness
3 unique complaints in this selection. Analysis snapshot: 2026-10-01.
Missing, zero and invalid mileage is excluded. Dates after the snapshot are excluded. Examples are limited selections, not a representative sample.
Problems by model year
Model-wide comparison of the eight most reported components across the model. Cells show counts and shares within each model year. Open a cell for source examples.
| Component | 2016 | 2017 | 2018 | 2020 | 2023 | 2024 |
|---|---|---|---|---|---|---|
| Unknown Or Other | 116.7%ODI 11687594Plastic oil filter housing fails pre-maturely and causes low coolant and/or oil level for the engine. This causes performance issues due to lack of cooling and lubrication and can lead to irreversible damage to the engine. | 360.0%ODI 11088576 · 14,500 miDRIVING ABOUT 40MPH ON A STRAIGHT ROAD, NO POTHOLES,ON SUNNY DAY, TEMP ABOUT 50. SUDDEN EXPLOSION AND SUNROOF EXPLODED OUTWARD. PULLED OFF ROAD, NOTHING HAD STRUCK THE CAR. THE SUNROOF GLASS WAS COMPLETELY SHATTERED. THERE WERE NO INJURIES | 00.0%No examples available for this selection. | 0UnavailableNo examples available for this selection. | 150.0%ODI 11501263the backup camera does not have enough lighting or contrast at night. you can't see behind the vehicle, especially on the sides. | 150.0%ODI 11595548I was driving on an empty highway at about 55 mph and all of a sudden heard a loud bang, after i pulled over i saw that my sunroof was shattered, bmw declined a warranty on it but the car had only 3k miles on it, prior to that accident i was hearing some squeaking noises from my sunroof when it was in fully closed position. After taking it to the dealership not only they declined on the warranty but they failed to investigate and explain the cause stating it was probably the rock hit the glass the caused the problem, i taped the sunroof after i… |
| Engine | 116.7%ODI 10885076 · 1,400 miSUDDEN ACCELERATION - ON TWO OCCASIONS (JUNE 12 AND 27, 2016), WHILE SLOWING AND COMING TO A STOP (ONCE TO PARK AND ONCE TO STOP AT A RED LIGHT BEHIND ANOTHER VEHICLE), THE CAR BUCKED AND REVVED AND WAS INCREDIBLY HARD TO CONTROL, LURCHING FORWARD. ON THE FIRST OCCASION IT LURCHED FORWARD AT A HIGH RATE OF FORCE AND HIT A FENCE AS I WAS PULLING IN SLOWLY TO PARK - I COULD NOT CONTROL IT WITH THE BRAKE UNTIL I PUT IT IN REVERSE; ON SECOND OCCASION (2 WEEKS LATER), I WAS ON A CITY STREET SLOWING TO 5MPH AND STOPPING AT A RED LIGHT AND SUDDENLY W… | 120.0%ODI 11464864My BMW had a pinhole in the radiator caused by driving on the highway and being impacted by a small foreign object. Apparently a foreign object (rock?) impacted the radiator creating a tiny leak. BMW repaired the vehicle (new radiator) and installed a "Rock Guard" without discussing this new Guard with me. Rock Guard Part # 17-11-8-185-042. This $1,900 repair is a known defect in the design which is why BMW adds the Rock Guard when replacing radiators. After the repair, research indicates this is a common issue for this model car. Loss … | 266.7%ODI 11399787 · 20,000 miRETURNING FROM A LOCAL GROCERY STORE I DROVE INTO OUR GARAGE AND SHUT OFF THE ENGINE. IMMEDIATELY I HEARD A LOUD POP FROM THE ENGINE COMPARTMENT, LIKE FROM A FIRECRACKER, AND I SAW BLACK SMOKE COMING FROM THE HOOD AND FROM THE LEFT WHEEL WELL. I IMMEDIATELY TRIED TO RESTART THE CAR TO DRIVE OUT OF THE GARAGE. NOTHING WORKED SO I PUSHED THE CAR OUT OF THE GARAGE BY HAND AND RELEASED THE HOOD LATCH. BY NOW THE HOOD'S EXTERNAL SAFETY LATCH WAS SO HOT I COULD NOT RELEASE IT. WITH THE HOOD CLOSED, I WAS UNABLE TO EXTINGUISH THE ENGINE FIRE USIN… | 0UnavailableNo examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. |
| Electrical System | 233.3%ODI 10885076 · 1,400 miSUDDEN ACCELERATION - ON TWO OCCASIONS (JUNE 12 AND 27, 2016), WHILE SLOWING AND COMING TO A STOP (ONCE TO PARK AND ONCE TO STOP AT A RED LIGHT BEHIND ANOTHER VEHICLE), THE CAR BUCKED AND REVVED AND WAS INCREDIBLY HARD TO CONTROL, LURCHING FORWARD. ON THE FIRST OCCASION IT LURCHED FORWARD AT A HIGH RATE OF FORCE AND HIT A FENCE AS I WAS PULLING IN SLOWLY TO PARK - I COULD NOT CONTROL IT WITH THE BRAKE UNTIL I PUT IT IN REVERSE; ON SECOND OCCASION (2 WEEKS LATER), I WAS ON A CITY STREET SLOWING TO 5MPH AND STOPPING AT A RED LIGHT AND SUDDENLY W… | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 0UnavailableNo examples available for this selection. | 150.0%ODI 11609474The dash board becomes so hot that it is too hot to touch the dash board and when this happens all the safety equipment stops working and shows warning on dash that has to be acknowledged and close message. The warning says that some or all safety equipment may or may not be working properly and shows a picture of all sensors with an X through them. This happens on a daily basses | 00.0%No examples available for this selection. |
| Wheels | 233.3%ODI 10958223 · 6,000 miHIT A POT HOLE & LATER FOR A LARGE BULGE IN THE SIDE WALL OF THE BRIDGESTONE POTENZA S001 RUN FLAT TIRE. THE TIRE WILL NEED TO BE REPLACED AT MY EXPENSE SINCE NO ONE(BMW OR BRIDGESTONE WILL TAKE RESPONSIBILITY FOR THIS TYPE OF DAMAGE. I WILL NEVER BUY A CAR WITH LOW PROFILE TIRES AGAIN. I DID REPLACE A PREVIOUSLY DEFECTIVE TIRE THAT DISPLACED A SIMILAR BULGE EVEN THOUGH THERE WAS NO INSTANCE OF A CSUSE FOR DAMAGE. I PURCHASED A REPLACEMENT AT COSTCO SINCE IT COMES WITH A WARRENTY FOR SAID DAMAGE. NOW COSTCO DOES NOT HAVE THIS TIRE IN THEIR INVE… | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 0UnavailableNo examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. |
| Air Bags | 116.7%ODI 11001819IN MARCH 2017, I WAS DRIVING SOUTHBOUND ON THE RIGHT LANE OF A PARKWAY, WHEN A VEHICLE THAT WAS TWO CARS BEHIND ME, ACCELERATES OUT TO THE MIDDLE LANE, HE LOSES CONTROL OF HIS VEHICLE, HIS CAR GOES TO THE LEFT LANE THEN TURNS AROUND ALMOST PERPENDICULAR TO ME, AND COLLIDES INTO MY VEHICLE PUSHING ME OFF ONTO THE EMBANKMENT, CONTINUING TO COLLIDE INTO MY CAR MULTIPLE TIMES, BEFORE HIS CAR GOES UP INTO THE AIR AND LANDS ON THE HOOD, BACKWARDS. I THOUGHT I WAS GOING TO DIE, AND THE MULTIPLE COLLISIONS AGAINST MY VEHICLE SEEMED ENDLESS. WHEN HIS CA… | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 0UnavailableNo examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. |
| Back Over Prevention: Rearview System Braking | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 0UnavailableNo examples available for this selection. | 00.0%No examples available for this selection. | 150.0%ODI 11581423The rear cross traffic alert system is a major safety issue on my 2024 BMW M340i. It basically does not operate. To get any kind of notification that there is a vehicle approaching from either right or left if you are backing up the approaching vehicle has to be traveling at a speed greater than 7 mph and then you only get an alert within 2 seconds of impact. This is a pointless operation as then it is too late to avoid a collision. The window is to narrow to provide any useful alert and safety function. Also, I receive no alert if a pedestrian… |
| Electrical System:Instrument Panel:Speedometer/Odometer | 00.0%No examples available for this selection. | 120.0%ODI 114428062017 BMW 340I. CONSUMER WRITES IN REGARDS TO MILEAGE DISCREPANCY. THE CONSUMER STATED THE COMPANY OFFLEASEONLY WAS RUNNING A SCAM, WHERE THEY ADVERTISE LOW MILEAGE CARS WHEN IN ACTUALLY THE MILEAGE IS CONSIDERABLY HIGHER. | 00.0%No examples available for this selection. | 0UnavailableNo examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. |
| Exterior Lighting | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 00.0%No examples available for this selection. | 0UnavailableNo examples available for this selection. | 150.0%ODI 11609474The dash board becomes so hot that it is too hot to touch the dash board and when this happens all the safety equipment stops working and shows warning on dash that has to be acknowledged and close message. The warning says that some or all safety equipment may or may not be working properly and shows a picture of all sensors with an X through them. This happens on a daily basses | 00.0%No examples available for this selection. |
Darker cells indicate a larger share of submitted complaints. Components overlap. This measures complaint composition, not failure probability.
Failure mileage by component
Median and middle 50% of usable owner-reported mileages. Ranges require at least five records.
| Component | Mileage range (25th–75th percentile) | Median | Usable records | Examples |
|---|---|---|---|---|
| Engine | Too few reports for a range | 20,000 mi | 1 (sparse) | ODI 11399787 · 20,000 miRETURNING FROM A LOCAL GROCERY STORE I DROVE INTO OUR GARAGE AND SHUT OFF THE ENGINE. IMMEDIATELY I HEARD A LOUD POP FROM THE ENGINE COMPARTMENT, LIKE FROM A FIRECRACKER, AND I SAW BLACK SMOKE COMING FROM THE HOOD AND FROM THE LEFT WHEEL WELL. I IMMEDIATELY TRIED TO RESTART THE CAR TO DRIVE OUT OF THE GARAGE. NOTHING WORKED SO I PUSHED THE CAR OUT OF THE GARAGE BY HAND AND RELEASED THE HOOD LATCH. BY NOW THE HOOD'S EXTERNAL SAFETY LATCH WAS SO HOT I COULD NOT RELEASE IT. WITH THE HOOD CLOSED, I WAS UNABLE TO EXTINGUISH THE ENGINE FIRE USIN… |
Complaint and recall timeline
Explore monthly filing activity alongside recall announcements. Up to ten years of monthly history is available.
Solid line: filed complaints. Dashed amber lines: recall announcement dates for this vehicle selection; markers include all recall components. The latest month is partial. Temporal proximity does not establish causation.
Monthly counts, recall campaigns and complaint examples
| Month | Complaints | Campaigns announced | Examples |
|---|---|---|---|
| 2024-11 | 0 | None | No examples available for this selection. |
| 2024-12 | 0 | None | No examples available for this selection. |
| 2025-01 | 0 | None | No examples available for this selection. |
| 2025-02 | 0 | None | No examples available for this selection. |
| 2025-03 | 0 | None | No examples available for this selection. |
| 2025-04 | 0 | None | No examples available for this selection. |
| 2025-05 | 0 | None | No examples available for this selection. |
| 2025-06 | 0 | None | No examples available for this selection. |
| 2025-07 | 0 | None | No examples available for this selection. |
| 2025-08 | 0 | None | No examples available for this selection. |
| 2025-09 | 0 | None | No examples available for this selection. |
| 2025-10 | 0 | None | No examples available for this selection. |
| 2025-11 | 0 | None | No examples available for this selection. |
| 2025-12 | 0 | None | No examples available for this selection. |
| 2026-01 | 0 | None | No examples available for this selection. |
| 2026-02 | 0 | None | No examples available for this selection. |
| 2026-03 | 0 | None | No examples available for this selection. |
| 2026-04 | 0 | None | No examples available for this selection. |
| 2026-05 | 0 | None | No examples available for this selection. |
| 2026-06 | 0 | None | No examples available for this selection. |
| 2026-07 | 0 | None | No examples available for this selection. |
| 2026-08 | 0 | None | No examples available for this selection. |
| 2026-09 | 0 | None | No examples available for this selection. |
| 2026-10 (partial) | 0 | None | No examples available for this selection. |
Emerging complaint spikes
Complete months in the latest six months with at least 10 complaints, at least twice the preceding 12-month average, and at least three square-root deviations above that average.
This is a descriptive screening rule, not a statistical defect finding. Publicity and reporting changes can increase submissions.
No complete months meet the spike thresholds for this selection.
Equal-age model-year comparison
Model-wide cumulative reports during the first three or five calendar years, starting with the model year (age 0). Only fully elapsed windows are compared.
2020: 0 complaints · 2023: 2 complaints
| Model year | Through age 0 | Through age 1 | Through age 2 |
|---|---|---|---|
| 2020 | 0 | 0 | 0 |
| 2023 | 1 | 2 | 2 |
Date coverage across each selected cohort
| Year | Incident dates used | Filing date fallbacks | Excluded dates |
|---|---|---|---|
| 2020 | 0 | 0 | 0 |
| 2023 | 2 | 0 | 0 |
Incident date is preferred when valid and no later than filing; otherwise filing date is used. Model year approximates age. Equal observation time does not adjust for sales, distance driven or reporting delays. One complaint linked to multiple model years can appear in each cohort.
Components reported together
Each cell counts unique complaints naming both components. Open a nonzero cell for examples.
| Component | Engine | Fuel/Propulsion System |
|---|---|---|
| Engine | — | 0 |
| Fuel/Propulsion System | 0 | — |
Co-reporting does not establish that one component caused another concern.
Recurring narrative patterns
Specific keyword mentions beyond broad component labels. Matching includes negations and comparisons and does not confirm a diagnosis.
0 patterns with matching reports.
No narratives match the published patterns.