The BMW 4 Series Coupe (G22 LCI), specifically the 420d variant with 190 horsepower and the Steptronic automatic transmission, represents a mid-cycle refresh of the G22 generation, introduced in March 2024. This model occupies a key position within the 4 Series lineup, offering a balance between performance, efficiency, and comfort. It caters to buyers seeking a premium coupe experience with the benefits of modern diesel technology and mild-hybrid assistance. The “LCI” (Life Cycle Impulse) facelift brings styling updates, enhanced technology, and refined powertrain options to the already popular 4 Series platform.
Technical Specifications
| Brand | BMW |
| Model | 4 Series |
| Generation | 4 Series Coupe (G22 LCI, facelift 2024) |
| Type (Engine) | 420d (190 Hp) Mild Hybrid Steptronic |
| Start of production | March, 2024 |
| Powertrain Architecture | MHEV (Mild Hybrid Electric Vehicle) |
| Body type | Coupe |
| Seats | 4 |
| Doors | 2 |
| Combined fuel consumption (WLTP) | 4.8-5.5 l/100 km (49 – 42.8 US mpg, 58.9 – 51.4 UK mpg, 20.8 – 18.2 km/l) |
| CO2 emissions (WLTP) | 126-144 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 7.1 sec |
| Acceleration 0 – 62 mph | 7.1 sec |
| Acceleration 0 – 60 mph | 6.7 sec |
| Maximum speed | 240 km/h (149.13 mph) |
| Emission standard | Euro 6e |
| Weight-to-power ratio | 8.4 kg/Hp, 118.4 Hp/tonne |
| Weight-to-torque ratio | 4 kg/Nm, 249.2 Nm/tonne |
| Gross battery capacity | 0.4 kWh |
| Battery voltage | 48 V |
| Battery technology | Lithium-ion (Li-Ion) |
| Battery location | Under the front hood |
| Electric motor power | 11 Hp |
| Electric motor Torque | 25 Nm (18.44 lb.-ft.) |
| Electric motor location | Front, Longitudinal |
| Power | 190 Hp @ 4000 rpm |
| Torque | 400 Nm @ 1750-2500 rpm (295.02 lb.-ft. @ 1750-2500 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | B47 |
| Engine displacement | 1995 cm3 (121.74 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Cylinder Bore | 84 mm (3.31 in.) |
| Piston Stroke | 90 mm (3.54 in.) |
| Compression ratio | 16.5:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Twin-power turbo, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 5.5 l (5.81 US qt | 4.84 UK qt) |
| Kerb Weight | 1605 kg (3538.42 lbs.) |
| Max. weight | 2090 kg (4607.66 lbs.) |
| Max load | 485 kg (1069.24 lbs.) |
| Trunk (boot) space – minimum | 440 l (15.54 cu. ft.) |
| Fuel tank capacity | 59 l (15.59 US gal | 12.98 UK gal) |
| Max. roof load | 75 kg (165.35 lbs.) |
| Permitted trailer load with brakes (12%) | 1600 kg (3527.4 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Permitted towbar download | 75 kg (165.35 lbs.) |
| Length | 4768 mm (187.72 in.) |
| Width | 1852 mm (72.91 in.) |
| Width including mirrors | 2081 mm (81.93 in.) |
| Height | 1383 mm (54.45 in.) |
| Wheelbase | 2851 mm (112.24 in.) |
| Front track | 1573 mm (61.93 in.) |
| Rear (Back) track | 1612 mm (63.46 in.) |
| Front overhang | 858 mm (33.78 in.) |
| Rear overhang | 1059 mm (41.69 in.) |
| Ride height (ground clearance) | 127 mm (5 in.) |
| Drag coefficient (Cd) | 0.25 |
| Minimum turning circle (turning diameter) | 11.4 m (37.4 ft.) |
| Number of gears and type of gearbox | 8 gears, automatic transmission Steptronic |
Powertrain & Engine Architecture
The heart of the 420d is BMW’s B47 2.0-liter inline-four cylinder diesel engine. This engine benefits from the latest generation of common-rail direct injection technology, delivering precise fuel metering for optimized combustion. A twin-scroll turbocharger with intercooling further enhances performance and responsiveness. The B47 engine is known for its robust construction and relatively straightforward maintenance. The 190 horsepower output is achieved at 4,000 rpm, while the substantial 400 Nm (295 lb-ft) of torque is available from a low 1,750 rpm, providing strong pulling power throughout the rev range. The mild-hybrid system, utilizing a 48V lithium-ion battery and an integrated starter generator, provides a small power boost during acceleration and enables smoother start-stop operation, contributing to improved fuel economy. The Steptronic 8-speed automatic transmission is a crucial component, offering smooth and efficient gear changes. It’s programmed to adapt to driving style and conditions, optimizing for both performance and fuel consumption.
Driving Characteristics
The 420d Automatic delivers a refined and comfortable driving experience. While not as overtly sporty as higher-powered 4 Series variants, the 190 hp engine provides ample power for everyday driving and confident highway cruising. The automatic transmission is well-tuned, offering quick and seamless shifts. The 0-60 mph time of around 6.7 seconds is respectable for a diesel-powered coupe. The readily available torque makes overtaking maneuvers easy and effortless. Compared to a manual transmission version, the Steptronic offers greater convenience, particularly in urban traffic. However, some drivers may prefer the more engaging feel of a manual gearbox. Compared to the 430i gasoline variant, the 420d prioritizes fuel efficiency and low-end torque over outright horsepower and high-revving performance.
Equipment & Trim Levels
The 420d typically comes well-equipped as standard. Key features include BMW’s iDrive infotainment system with a central touchscreen display, navigation, Apple CarPlay and Android Auto compatibility, automatic climate control, and a leather-wrapped steering wheel. Upholstery is generally a high-quality cloth or leatherette, with full leather options available as an upgrade. Optional extras include a premium sound system, heated seats, a head-up display, and advanced driver-assistance systems such as adaptive cruise control and lane-keeping assist. The LCI facelift brought updated interior trim options and enhanced digital displays.
Chassis & Braking
The 4 Series Coupe features a sophisticated chassis designed to balance comfort and handling. The front suspension utilizes spring struts with a transverse stabilizer, while the rear employs an independent multi-link setup, also with a stabilizer bar. This configuration provides a good level of ride comfort while maintaining precise control in corners. The 420d typically features ventilated disc brakes on all four wheels, providing ample stopping power. ABS (Anti-lock Braking System) and electronic stability control are standard safety features. The steering is electrically assisted, offering a precise and responsive feel.
Market Reception & Comparison
The 420d Automatic has been generally well-received by automotive critics. It’s praised for its fuel efficiency, comfortable ride, and refined powertrain. The mild-hybrid system is seen as a positive addition, further enhancing fuel economy and reducing emissions. Compared to other trims in the 4 Series lineup, the 420d offers a more affordable entry point while still delivering a premium driving experience. Its fuel economy is significantly better than that of the gasoline-powered 430i and 440i models, making it a popular choice for drivers who prioritize efficiency. Reliability has been generally good, although diesel engines can be more susceptible to issues with the diesel particulate filter (DPF) if not driven on longer journeys periodically.
Legacy
The B47 engine, in various iterations, has proven to be a durable and reliable powerplant. The 420d variant, with its mild-hybrid assistance, represents a step towards greater efficiency and sustainability. On the used car market, well-maintained examples of the 420d Coupe (G22 LCI) are expected to hold their value reasonably well, appealing to buyers seeking a stylish and economical coupe. Regular servicing, including DPF maintenance, is crucial to ensure long-term reliability. The combination of BMW’s engineering expertise and the benefits of modern diesel technology make the 420d a compelling option in the premium coupe segment.
