The 2024 BMW 420i Coupe with the Steptronic automatic transmission represents an accessible entry point into the 4 Series range. Positioned below the more powerful 430i and M440i models, it’s designed for drivers prioritizing a comfortable grand touring experience with reasonable fuel economy. The G22 LCI facelift brings subtle but noticeable changes to the exterior styling, including revised headlights and a redesigned kidney grille, along with interior upgrades focused on the infotainment system and materials. This model is primarily targeted towards the European and North American markets, where the coupe segment remains popular.
Technical Specifications
| Brand | BMW |
| Model | 4 Series |
| Generation | 4 Series Coupe (G22 LCI, facelift 2024) |
| Type (Engine) | 420i (184 Hp) Steptronic |
| Start of production | March, 2024 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 4 |
| Doors | 2 |
| Combined fuel consumption (WLTP) | 6.3-7.1 l/100 km (37.3 – 33.1 US mpg, 44.8 – 39.8 UK mpg, 15.9 – 14.1 km/l) |
| CO2 emissions (WLTP) | 143-161 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 7.5 sec |
| Acceleration 0 – 62 mph | 7.5 sec |
| Acceleration 0 – 60 mph | 7.1 sec |
| Maximum speed | 240 km/h (149.13 mph) |
| Emission standard | Euro 6e |
| Weight-to-power ratio | 8.3 kg/Hp, 120.7 Hp/tonne |
| Weight-to-torque ratio | 5.1 kg/Nm, 196.7 Nm/tonne |
| Power | 184 Hp @ 5000-6500 rpm |
| Power per litre | 92.1 Hp/l |
| Torque | 300 Nm @ 1350-4000 rpm (221.27 lb.-ft. @ 1350-4000 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | B48 |
| Engine displacement | 1998 cm3 (121.93 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Cylinder Bore | 82 mm (3.23 in.) |
| Piston Stroke | 94.6 mm (3.72 in.) |
| Compression ratio | 11:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Twin-power turbo, Intercooler |
| Valvetrain | Double-VANOS, VALVETRONIC |
| Engine oil capacity | 5.25 l (5.55 US qt | 4.62 UK qt) |
| Engine systems | Start & Stop System, Particulate filter |
| Kerb Weight | 1525 kg (3362.05 lbs.) |
| Max. weight | 2015 kg (4442.31 lbs.) |
| Max load | 490 kg (1080.27 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.) |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives the rear wheels of the vehicle. |
| Drive wheel | Rear wheel drive |
| Number of gears and type of gearbox | 8 gears, automatic transmission Steptronic |
| Front suspension | Spring Strut, Transverse stabilizer |
| Rear suspension | Independent multi-link spring suspension with stabilizer |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
| Tires size | 225/50 R17 |
| Wheel rims size | 7.5J x 17 |
Powertrain & Engine Architecture
At the heart of the 420i is BMW’s B48 2.0-liter inline-four cylinder engine. This engine utilizes direct fuel injection and is equipped with a twin-scroll turbocharger and BMW’s VALVETRONIC fully variable valve timing and Double-VANOS variable camshaft timing. These technologies work in concert to optimize power delivery and fuel efficiency. The engine produces 184 horsepower at 5000-6500 rpm and 300 Nm (221 lb-ft) of torque between 1350 and 4000 rpm. The Steptronic transmission is an 8-speed automatic, known for its smooth shifts and responsiveness. It features a torque converter and allows for both automatic and manual gear selection via steering wheel-mounted paddles. The transmission is specifically tuned to complement the engine’s characteristics, prioritizing fuel economy and comfortable cruising.
Driving Characteristics
The 420i Steptronic delivers a refined and comfortable driving experience. While not as overtly sporty as its higher-powered siblings, it provides ample power for everyday driving and highway cruising. The 0-60 mph acceleration time of around 7.1 seconds is respectable, and the engine’s broad torque curve ensures effortless overtaking. The Steptronic transmission contributes to a relaxed driving style, with smooth gear changes and intelligent shift programming. Compared to a manual transmission equipped 420i, the automatic offers greater convenience, particularly in urban traffic. However, it may slightly diminish the driver’s sense of engagement. The gear ratios are optimized for fuel efficiency, with higher gears providing relaxed cruising at highway speeds.
Equipment & Trim Levels
The standard equipment on the 420i Coupe includes features such as BMW’s iDrive infotainment system with a curved display, automatic climate control, power-adjustable front seats, and a suite of driver-assistance systems like lane departure warning and forward collision warning. Interior upholstery typically consists of Sensatec leatherette, with options for genuine leather available. Optional extras include a premium sound system, a head-up display, adaptive suspension, and a variety of cosmetic enhancements. The LCI facelift introduced updated interior trim options and improved materials, enhancing the overall sense of luxury.
Chassis & Braking
The 420i Coupe utilizes a MacPherson strut front suspension and a multi-link rear suspension, providing a good balance of ride comfort and handling precision. Stabilizer bars are fitted to both axles to reduce body roll during cornering. The braking system consists of ventilated disc brakes on all four wheels, providing ample stopping power. ABS (Anti-lock Braking System) is standard, along with electronic brake-force distribution and brake assist. The chassis is tuned to prioritize comfort and stability, making it a pleasant companion for long journeys.
Market Reception & Comparison
The 420i Steptronic has generally received positive reviews for its comfortable ride, refined engine, and fuel efficiency. Critics have noted that it may not offer the same level of performance as the 430i or M440i, but it provides a compelling value proposition for buyers seeking a stylish and comfortable coupe. Compared to the 430i, the 420i offers better fuel economy but less acceleration. The 420i’s automatic transmission is often praised for its smoothness and responsiveness, making it a popular choice for drivers who prefer convenience over outright performance.
Legacy
The B48 engine family, including the version found in the 420i, has proven to be relatively reliable, although some early models experienced issues with oil leaks. The Steptronic 8-speed automatic transmission is also known for its durability. On the used car market, the 2024 420i Coupe is expected to hold its value reasonably well, thanks to the BMW brand’s reputation for quality and the model’s appealing combination of style, comfort, and efficiency. Regular maintenance, including oil changes and adherence to BMW’s recommended service intervals, is crucial for ensuring the long-term reliability of this powertrain.
