⌘K
Home›BMW›4 Series›2018
BMW · Compact car

2018 BMW 4 Series

Gas
Compact Cars
15 EPA-rated configurations
Data refreshed 2026-09-11
A
Safety Signal
92 / 100 from the NHTSA recall record
RecallsNHTSA campaigns1
Complaintsowner reports to NHTSA43
Crash ratingNHTSA overall—
Fuel economybest combined, EPA27 mpg
202720262025202420232022202120202019201820172016

The 2018 BMW 4 Series is sold in the U.S. as a gas compact car with 15 EPA-rated configurations. The most efficient version, the 430i Convertible, is EPA-rated at 27 mpg combined. NHTSA lists 1 recall campaign for this model year, which gives it a Safety Signal grade of A. Owners have filed 43 complaints, most often about the engine.

Specs & fuel economy

Source: EPA fueleconomy.gov
ConfigurationPowertrainDriveEngine / motorCityHwyCombAnnual fuel*
430i ConvertibleGasRWD2.0L 4-cyl turbo243427$2,850
430i CoupeGasRWD2.0L 4-cyl turbo243427$2,850
430i Gran CoupeGasRWD2.0L 4-cyl turbo243427$2,850
430i xDrive CoupeGasAWD2.0L 4-cyl turbo233327$2,850
430i xDrive Gran CoupeGasAWD2.0L 4-cyl turbo233327$2,850
430i xDrive ConvertibleGasAWD2.0L 4-cyl turbo223226$3,000
430i CoupeGasRWD2.0L 4-cyl turbo213325$3,100
440i CoupeGasRWD3.0L 6-cyl turbo213225$3,100
440i Gran CoupeGasRWD3.0L 6-cyl turbo213225$3,100
440i xDrive CoupeGasAWD3.0L 6-cyl turbo213125$3,100
440i xDrive Gran CoupeGasAWD3.0L 6-cyl turbo213125$3,100
440i ConvertibleGasRWD3.0L 6-cyl turbo212924$3,250
440i CoupeGasRWD3.0L 6-cyl turbo192923$3,350
440i xDrive ConvertibleGasAWD3.0L 6-cyl turbo202923$3,350
440i xDrive CoupeGasAWD3.0L 6-cyl turbo192923$3,350

*EPA estimate at 15,000 miles/year at EPA reference fuel and electricity prices. fueleconomy.gov record ids: 38600, 38612, 38615, 38614, 38616, 38601, 38613, 38617, 38620, 38618.

Factory warranty running out?

The 2018 BMW 4 Series is in the years where transmission, electronics and drivetrain repairs land on the owner. Compare extended-coverage quotes in about two minutes.

Compare coverage →

Affiliate disclosure: some links on this page are affiliate links. If you request a quote or buy through them we may earn a commission at no extra cost to you. Nothing on this page changes because of it.

Recalls (1)

Source: NHTSA recall database
▲high

Seat Belts

67 vehicles
ProblemBMW of North America, LLC (BMW) is recalling certain 2018 430i, 430i xDrive, 440i, 440i xDrive, and M4 convertible vehicles. The Emergency Locking Retractors (ELR) within the front seat belt assemblies may have been produced with incompatible vehicle-sensitive locking mechanism housings.RiskIf the vehicle has an incompatible vehicle-sensitive locking mechanism, the seat belt may not restrain the seat occupant in the event of a crash, increasing the risk of injury.FixBMW will notify owners, and dealers will inspect and, if necessary replace, the front seat belt assemblies, free of charge. The recall began October 13, 2017. Owners may contact BMW customer service at 1-800-525-7417.
NHTSA campaign 17V507000reported Aug 16, 2017BMW of North America, LLC

NHTSA defect investigations

Air Bags:Frontal:Passenger Side:Inflator Module — Desiccated Air Bag Inflator Rupture open

From 2000 through 2017, Takata produced millions of air bag inflators using two types of phase-stabilized ammonium nitrate ("PSAN") propellant -- propellant 2004 and propellant 2004L. After prolonged exposure to high temperature cycles and humidity, inflators using propellant 2004 can degrade, causing the propellant to burn too quickly when ignited. The rapid burning can cause the inflator to rupture during deployment, potentially causing serious or even fatal injury to vehicle occupants. See 2016 Blomquist Report at www.nhtsa.gov/sites/nhtsa.gov/files/documents/expert_report-hrblomquist.pdf.Consequently, all frontal inflators using propellant 2004 that do not contain a "desiccant" (a substa

Opened Sep 17, 2021 · action EA21002

Owner complaints

Source: NHTSA complaint database
43complaints filed

6 involved a crash · 2 a fire · 9 injuries · 0 deaths reported

Filed per year: 2018: 2 · 2019: 1 · 2020: 4 · 2021: 5 · 2022: 7 · 2023: 3 · 2024: 9 · 2025: 5 · 2026: 7

Most-cited components

Engine14
Electrical System9
Engine And Engine Cooling8
Unspecified6
Seat Belts5
Structure3

What owners describe

“Disconnect coupling on cylinder head broke caused loss of coolant from engine. Overheated my Car damaged the engine and the car did accelerate when I was crossing a highway almost causing a collision”Aug 8, 2025 · Engine · NHTSA owner report
“The contact owns a 2018 BMW 430I. The contact stated that while the vehicle was parked, the contact discovered that there was an unknown liquid leaking underneath the vehicle. The coolant warning light was illuminated. The vehicle was taken to a dealer, where it was diagnosed that there was a leak in the water pump and…”Mar 18, 2025 · Engine And Engine Cooling · NHTSA owner report
“The contact owns a 2018 BMW 430I. The contact stated while driving at an undisclosed speed, the vehicle lost motive power. The vehicle was restarted; however, the failure persisted. The vehicle was driven to a local parking lot and then to the residence. The vehicle was later towed to the dealer where it was diagnosed …”Jan 17, 2025 · Engine And Engine Cooling · NHTSA owner report

Complaint counts are raw owner reports to NHTSA, not verified defects, and scale with how many were sold. Use them to spot patterns, not to rank.

Crash ratings

Source: NHTSA NCAP

NHTSA has not published 5-Star crash ratings for this model year.

Other 4 Series model years

A

2027 BMW 4 Series

0 recalls · 0 complaints

B

2026 BMW 4 Series

1 recalls · 2 complaints

B

2025 BMW 4 Series

1 recalls · 8 complaints

F

2024 BMW 4 Series

3 recalls · 2 complaints

F

2023 BMW 4 Series

4 recalls · 6 complaints

F

2022 BMW 4 Series

5 recalls · 8 complaints

F

2021 BMW 4 Series

6 recalls · 15 complaints

A

2020 BMW 4 Series

1 recalls · 5 complaints

C

2019 BMW 4 Series

3 recalls · 25 complaints

B

2017 BMW 4 Series

2 recalls · 29 complaints

B

2016 BMW 4 Series

1 recalls · 53 complaints

Sources & method

Safety Signal starts every model-year at 100 and subtracts points per open NHTSA recall campaign by severity: critical 15 (fire risk, park-outside or do-not-drive advisories), high 8 (brakes, steering, airbags, loss of drive power, structure, battery), moderate 6, minor 3 (software, labels, lighting fixed by an update). Floor 35. A ≥ 90, B ≥ 80, C ≥ 70, D ≥ 60, otherwise F. Complaint counts and NHTSA crash ratings are shown separately and are not blended into the grade.

EPA figures come from fueleconomy.gov vehicle records. Recalls, complaints, investigations and crash ratings come from NHTSA's public flat files, refreshed weekly.

JSON for this page · API