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BMW 430IModel year report

2018 BMW 430I Problems

Complaints
36filed with NHTSA
Median mileage
54,348miles, 15 complaints with mileage
Recalls
1campaigns on record
Trend
RisingComplaints filed in the last 3 full calendar years are at least 25% higher than in the 3 years before.
NHTSA crash rating
—no overall rating published
EPA fuel economy
27 mpgcombined, 2.0L 4-cyl RWD · 24 city / 34 hwy

Sources: NHTSA records for the 2018 BMW 430I (complaints, recalls, investigations), EPA fuel economy. Report an error

NHTSA recorded 36 consumer complaints for the 2018 BMW 430I. The part named most often is engine, with 14 complaints (39% of the total), followed by engine cooling (8) and electrical system (5). 15 of the complaints include a mileage, and 47% of those were filed for vehicles with under 50,000 miles; the median is 54,348 miles. Of all complaints, 4 involved a crash, 2 a fire, 5 an injury, according to the filers. NHTSA lists 1 recall campaign and 192 technical service bulletins for this model year. Engine complaints overlap with 15 technical service bulletins filed under the same part. Engine cooling complaints overlap with 24 technical service bulletins filed under the same part.

Not compared (fewer than 3 comparable model years). Model years 2008–2023 of the same vehicle that have at least 25 complaints are compared, and a model needs at least 3 of them.

Which parts are reported most

Complaints can name more than one part, so the counts add up to more than the total. Select a part to see its complaints, recalls and bulletins.

Also reported: Back-over prevention (rear camera) (1), Lane departure (1), Tires (1), Vehicle speed control (1), Visibility (wipers, defrost, mirrors) (1).

Example complaints

Engine: “My BMW 430i 2018showed no warning and suddenly the car started to shake, I stopped immediately and after the car cooled, there was no coolant, the oil temperature gage was always on normal. The car overheated and caused catastrophic engine failure, and need replacement. Upon inspection by several mechanics, its obvious the coolant leak from a hose that connects with engine block”

NHTSA complaint #11580162, filed 2024-03

Engine cooling: “The contact owns a 2018 BMW 430I. The contact stated that while the dealer was servicing the vehicle, the dealer informed the contact there were several coolant leaks found. The dealer advised the contact to regularly add coolant to the vehicle. Additionally, the contact stated while driving 40-50 MPH, the vehicle experienced reduced power. Several unknown warning lights were illuminated. The messages Vehicle Engine Heating - Drive Moderately and Drivetrain Malfunction were displayed. …”

NHTSA complaint #11616045, filed 2024-09, 75,000 miles

Electrical system: “While parked, car went on with gear shift failure with a note to take in for service, no lights on gear shift. Restarted car with it functioning as normal. 2 hours later, doors unlock on its own and all windows, sunroof also open on its own while in motion. Not exactly sure what is the defect as the car seems to be out of control from the driver/passenger.”

NHTSA complaint #11143083, filed 2018-10, 7,388 miles

Seat belts: “A few months ago, June 18, 2025 my 2018 BMW 430i convertible, which has 57,202 miles on the odometer, alerted me that the passenger side restraint system was malfunctioning. BMW declined to address the issue. Now, I am receiving the same notification for the driver side. Once again, BMW refuses to provide repairs. This poses a significant safety risk, as my airbags could potentially deploy unexpectedly during normal driving, and my seatbelts may fail to secure me in the event of an accident. …”

NHTSA complaint #11711900, filed 2026-01

Mileage when problems were reported

47% of the 15 complaints with a mileage were filed for vehicles with under 50,000 miles; the middle half falls between 33,000 and 74,000 miles.

13%0–1013%10–2520%25–5027%50–7527%75–1000%100–1500%150+
Share of complaints by mileage when the problem was reported, in thousands of miles (15 complaints with mileage). Red bars: under 50,000 miles. Bucket widths differ. Median: 54,348 miles.

Complaints by year filed

Trend: rising. Complaints filed in the last 3 full calendar years are at least 25% higher than in the 3 years before.

2018201920202021202220232024920252026
Complaints by year the complaint was filed with NHTSA. Red bars: the last 3 full calendar years used for the trend. The current year (2026) is partial.

Fuel economy and running cost

EPA ratings for each 2018 BMW 430I version. Annual fuel cost is the EPA's estimate at its current fuel prices for 15,000 miles a year (55% city driving).

VersionEngineTransmissionCityHwyComb.Fuel / yr
430i Convertible RWD2.0L 4-cyl8-speed automatic243427$3,050
430i Coupe RWD2.0L 4-cyl8-speed automatic243427$3,050
430i Coupe RWD2.0L 4-cyl6-speed manual213325$3,300
430i Gran Coupe RWD2.0L 4-cyl8-speed automatic243427$3,050
430i xDrive Convertible AWD2.0L 4-cyl8-speed automatic223226$3,150
430i xDrive Coupe AWD2.0L 4-cyl8-speed automatic233327$3,050
430i xDrive Gran Coupe AWD2.0L 4-cyl8-speed automatic233327$3,050

Source: U.S. EPA and Department of Energy, fueleconomy.gov. Ratings are for comparing vehicles; real-world mileage varies with driving and conditions.

Recalls and investigations

Recall details for the 2018 BMW 430I → · Check a VIN at nhtsa.gov/recalls

Technical service bulletins

TSBs are manufacturer notes to dealers about known repair procedures. They are not recalls and do not by themselves mean a vehicle has a fault. 192 on record; the latest 10 are shown.

See all 192 bulletins →

Other model years of the BMW 430I

YearComplaintsMedian miRecallsCrash ★MPGScore (50 = typical)Trend
20256—1—30—Too new
2022818,0005—28—Not enough data
20211513,0006—29—Rising
2020576,2381—27—Not enough data
20192363,0003—27—Rising
20183654,3481—27Not compared (fewer than 3 comparable model years)Rising
20172557,7002—27Not compared (fewer than 3 comparable model years)Rising

All BMW 430I model years

Frequently asked questions

How many NHTSA complaints does the 2018 BMW 430I have?

NHTSA recorded 36 consumer complaints for the 2018 BMW 430I as of Oct 28, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.

What part of the 2018 BMW 430I is reported most often?

Engine is named most often, in 14 complaints (39% of the total), followed by engine cooling with 8.

Has the 2018 BMW 430I been recalled?

NHTSA lists 1 recall campaign for this model year. To check a specific vehicle, enter its VIN at nhtsa.gov/recalls.

What gas mileage does the 2018 BMW 430I get?

The EPA rates the 2018 BMW 430I (430i Convertible, 2.0L 4-cyl) at 27 mpg combined, 24 city and 34 highway, with an estimated annual fuel cost of $3,050 at 15,000 miles a year. Other engine and drive versions are rated differently.

At what mileage are problems with the 2018 BMW 430I reported?

Among the 15 complaints that include a mileage, the median is 54,348 miles and the middle half falls between 33,000 and 74,000 miles; 47% were filed for vehicles with under 50,000 miles.

About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 28, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate. Fuel economy is from the EPA and DOE (fueleconomy.gov).

Complaint counts come from NHTSA’s public complaint database; we count each complaint once. The source records for this vehicle are on nhtsa.gov. Scores and trends are our own summaries of that data, described in the methodology. This page is not legal, safety or repair advice: for a specific vehicle, check its VIN at nhtsa.gov/recalls and ask a qualified mechanic. See an error? Tell us.