The BMW 4 Series Coupe (F32) 420d xDrive Steptronic, produced from 2015 to 2016, represents a compelling blend of performance, efficiency, and all-weather capability within the broader 4 Series lineup. Positioned as a mid-range offering, it catered to buyers seeking a sporty coupe experience with the added security of BMW’s xDrive all-wheel-drive system and the convenience of an eight-speed automatic transmission. This variant occupied a space between the entry-level 420i and the more potent 435i/440i models, offering a diesel-powered alternative focused on torque and fuel economy. It was part of the F32 generation, built on the BMW’s then-current modular platform, offering a sophisticated driving experience.
Technical Specifications
| Brand | BMW |
| Model | 4 Series |
| Generation | 4 Series Coupe (F32) |
| Type (Engine) | 420d (190 Hp) xDrive Steptronic |
| Start of production | 2015 |
| End of production | 2016 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (economy) – urban (NEDC) | 5.2-5.6 l/100 km (45.2 – 42 US mpg, 54.3 – 50.4 UK mpg, 19.2 – 17.9 km/l) |
| Fuel consumption (economy) – extra urban (NEDC) | 4-4.2 l/100 km (58.8 – 56 US mpg, 70.6 – 67.3 UK mpg, 25 – 23.8 km/l) |
| Fuel consumption (economy) – combined (NEDC) | 4.4-4.7 l/100 km (53.5 – 50 US mpg, 64.2 – 60.1 UK mpg, 22.7 – 21.3 km/l) |
| CO2 emissions (NEDC) | 117-125 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 7.2 sec |
| Acceleration 0 – 62 mph | 7.2 sec |
| Acceleration 0 – 60 mph | 6.8 sec |
| Maximum speed | 230 km/h (142.92 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 8.2 kg/Hp, 121.8 Hp/tonne |
| Weight-to-torque ratio | 3.9 kg/Nm, 256.4 Nm/tonne |
| 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 | B47D20A |
| 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 l (5.28 US qt | 4.4 UK qt) |
| Coolant | 7 l (7.4 US qt | 6.16 UK qt) |
| Kerb Weight | 1560 kg (3439.21 lbs.) |
| Max. weight | 2080 kg (4585.62 lbs.) |
| Max load | 520 kg (1146.4 lbs.) |
| Trunk (boot) space – minimum | 445 l (15.72 cu. ft.) |
| Fuel tank capacity | 57 l (15.06 US gal | 12.54 UK gal) |
| Max. roof load | 75 kg (165.35 lbs.) |
| Permitted trailer load with brakes (8%) | 1800 kg (3968.32 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 | 4638 mm (182.6 in.) |
| Width | 1825 mm (71.85 in.) |
| Width including mirrors | 2017 mm (79.41 in.) |
| Height | 1392 mm (54.8 in.) |
| Wheelbase | 2810 mm (110.63 in.) |
| Front track | 1545 mm (60.83 in.) |
| Rear (Back) track | 1594 mm (62.76 in.) |
| Front overhang | 787 mm (30.98 in.) |
| Rear overhang | 1041 mm (40.98 in.) |
| Ride height (ground clearance) | 145 mm (5.71 in.) |
| Drag coefficient (Cd) | 0.29 |
| Minimum turning circle (turning diameter) | 11.8 m (38.71 ft.) |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives permanently the four wheels of the vehicle. |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 8 gears, automatic transmission Steptronic |
| Front suspension | Spring Strut |
| Rear suspension | Independent multi-link suspension |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
Powertrain & Engine Architecture
The heart of the 420d xDrive Steptronic is BMW’s B47D20A 2.0-liter inline-four diesel engine. This engine is a member of BMW’s modular engine family, known for its efficiency and refinement. It utilizes a second-generation common rail direct injection system operating at pressures up to 2,000 bar, ensuring precise fuel delivery and optimized combustion. The engine is turbocharged with a twin-scroll turbocharger, enhancing responsiveness and minimizing turbo lag. An intercooler further cools the intake air, increasing power output. The valvetrain employs a Double Overhead Camshaft (DOHC) design with four valves per cylinder. The engine also features BMW’s Start & Stop system and a particulate filter to reduce emissions, meeting Euro 6 standards. The eight-speed Steptronic automatic transmission is a key component, offering smooth and quick shifts. It’s programmed for both comfort and performance, adapting to driving style and conditions.
Driving Characteristics
The 420d xDrive Steptronic delivers a refined and capable driving experience. While not as overtly sporty as the gasoline-powered 4 Series variants, the 400 Nm (295 lb-ft) of torque available from 1750-2500 rpm provides strong acceleration and effortless cruising. The xDrive all-wheel-drive system enhances traction, particularly in adverse weather conditions, providing a surefooted feel. The eight-speed automatic transmission contributes to smooth progress, and the gear ratios are well-chosen for both fuel efficiency and responsive acceleration. Compared to the manual transmission versions, the automatic offers greater convenience, especially in urban environments. However, some enthusiasts might find the automatic slightly less engaging than the manual. The 0-60 mph time of around 6.8 seconds is respectable for a diesel coupe.
Equipment & Trim Levels
The 420d xDrive Steptronic typically came equipped with a generous level of standard features. These included leather upholstery, automatic climate control, a BMW iDrive infotainment system with a central display screen, and a suite of safety features such as ABS, stability control, and multiple airbags. Optional extras included features like a premium sound system, navigation, heated seats, a sunroof, and various driver assistance systems like lane departure warning and adaptive cruise control. Interior trim options varied, allowing buyers to personalize the cabin to their preferences.
Chassis & Braking
The 4 Series Coupe features a sophisticated chassis designed for balanced handling. The front suspension utilizes MacPherson struts, while the rear employs a multi-link independent suspension. This setup provides a good balance between ride comfort and handling precision. The 420d xDrive Steptronic is equipped with ventilated disc brakes on all four wheels, providing ample stopping power. The xDrive all-wheel-drive system distributes power between the front and rear axles as needed, optimizing traction and stability. The steering is electrically assisted, offering precise and responsive control.
Market Reception & Comparison
The 420d xDrive Steptronic was generally well-received by automotive critics. It was praised for its fuel efficiency, comfortable ride, and all-weather capability. Compared to the 420i, the 420d offered superior torque and fuel economy, making it a more practical choice for long-distance driving. However, the 420i was often preferred by those prioritizing a more sporty driving experience. The 435i/440i models offered significantly more power, but at a higher price point. The 420d struck a good balance between performance, efficiency, and affordability.
Legacy
The B47 engine family, including the B47D20A found in the 420d, has proven to be relatively reliable, although some early examples experienced issues with timing chain wear. Regular maintenance, including oil changes and adherence to BMW’s service schedule, is crucial for long-term reliability. Today, the F32 420d xDrive Steptronic represents a compelling value proposition in the used car market. It offers a stylish and well-equipped coupe experience with good fuel economy and all-weather capability. Its reputation for reliability, combined with its relatively affordable price, makes it an attractive option for buyers seeking a premium coupe without breaking the bank.
