The BMW 4 Series Coupe (F32), specifically the 420d xDrive Steptronic variant produced from 2017 to 2020, represents a mid-cycle refresh of the F32 generation. This model, positioned as a premium compact executive coupe, offered a blend of sporty handling, refined comfort, and efficient diesel power. The “xDrive” designation indicates BMW’s all-wheel-drive system, while “Steptronic” refers to the eight-speed automatic transmission. This particular configuration aimed to provide a balance between performance and fuel economy, appealing to buyers seeking a sophisticated grand tourer with all-weather capability. It sat in the middle of the 4 Series lineup, offering a step up from the base 420i while remaining more accessible than the higher-performance 430i or M4 models.
Technical Specifications
| Brand | BMW |
| Model | 4 Series |
| Generation | 4 Series Coupe (F32, facelift 2017) |
| Type (Engine) | 420d (190 Hp) xDrive Steptronic |
| Start of production | 2017 |
| End of production | 2020 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (urban) | 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 (extra urban) | 4.0-4.2 l/100 km (58.8 – 56 US mpg, 70.6 – 67.3 UK mpg, 25 – 23.8 km/l) |
| Fuel consumption (combined) | 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 | 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 |
| 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 (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 | 4640 mm (182.68 in.) |
| Width | 1825 mm (71.85 in.) |
| Height | 1392 mm (54.8 in.) |
| Wheelbase | 2810 mm (110.63 in.) |
| Front track | 1543 mm (60.75 in.) |
| Rear (Back) track | 1589 mm (62.56 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.) |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 8 gears, automatic transmission Steptronic |
| Front suspension | Independent coil spring |
| Rear suspension | Independent multi-link suspension |
| 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; 225/45 R18; 255/40 R18; 225/40 R19; 255/35 R19 |
| Wheel rims size | 7.5J x 17; 8J x 18; 8.5J x 18; 8J x 19; 8.5J x 19 |
INTRODUCTION
The BMW 420d xDrive Steptronic, part of the F32 4 Series lineup (produced 2013-2020, with the facelift arriving in 2017), offered a compelling package for buyers seeking a sporty yet practical coupe. Built on the BMW’s flexible 3 Series (F30) platform, the 4 Series distinguished itself with a lower, wider stance and more aggressive styling. The 420d variant, powered by a 2.0-liter turbocharged diesel engine, was designed to deliver strong fuel economy and adequate performance for everyday driving. The inclusion of xDrive all-wheel drive enhanced traction and stability, particularly in inclement weather, making it a popular choice in regions with challenging climates. This model aimed to bridge the gap between the entry-level 420i and the more powerful 430i, offering a balance of cost, efficiency, and driving enjoyment.
Powertrain & Engine Architecture
At the heart of the 420d xDrive Steptronic lies the BMW 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. The B47 utilizes a common-rail direct injection system, injecting fuel at extremely high pressures to optimize combustion. A twin-scroll turbocharger, coupled with an intercooler, provides increased power and torque output. The engine produces 190 horsepower at 4,000 rpm and a substantial 400 Nm (295 lb-ft) of torque between 1,750 and 2,500 rpm. This broad torque curve contributes to strong acceleration and effortless cruising. The engine also features variable valve timing (VANOS) and variable turbine geometry (VTG) on the turbocharger to further enhance efficiency and responsiveness. The eight-speed Steptronic automatic transmission is a key component of the powertrain. This transmission offers smooth and quick shifts, and features adaptive learning algorithms that adjust shift points based on driving style. It also includes a manual shift mode for greater driver control.
Driving Characteristics
The 420d xDrive Steptronic delivers a refined and comfortable driving experience. While not as overtly sporty as the 430i or M4, it provides ample power for everyday driving and confident overtaking maneuvers. The xDrive all-wheel-drive system provides excellent traction, particularly on slippery surfaces, inspiring confidence in various driving conditions. The eight-speed automatic transmission contributes to smooth acceleration and efficient cruising. Compared to the manual transmission versions of the 420d, the Steptronic automatic offers greater convenience and ease of use, especially in urban traffic. However, some enthusiasts may find the manual transmission more engaging. The 420d’s power delivery is characterized by its strong low-end torque, making it feel responsive even at lower engine speeds. The steering is precise and well-weighted, providing good feedback to the driver. Overall, the 420d xDrive Steptronic offers a balanced and enjoyable driving experience that prioritizes comfort and refinement.
Equipment & Trim Levels
The 420d xDrive Steptronic came standard with a comprehensive list of features, including automatic climate control, power-adjustable front seats, a BMW iDrive infotainment system with a 6.5-inch display screen, and a suite of safety features such as ABS, stability control, and multiple airbags. Common options included leather upholstery, a premium sound system, a larger iDrive display screen with navigation, a sunroof, and adaptive headlights. Trim levels varied depending on the market, but generally included Sport Line, Luxury Line, and M Sport packages. The Sport Line added exterior styling cues and interior trim elements designed to enhance the car’s sporty appearance. The Luxury Line focused on adding a more refined and elegant touch, while the M Sport package included more aggressive styling, sport suspension, and upgraded brakes.
Chassis & Braking
The 420d xDrive Steptronic utilizes a sophisticated chassis design to deliver a comfortable and engaging driving experience. The front suspension features independent coil springs and struts, while the rear suspension employs an independent multi-link setup. This configuration provides excellent ride quality and precise handling. The xDrive all-wheel-drive system distributes power between the front and rear axles as needed, optimizing traction and stability. The braking system consists of ventilated discs on all four wheels, providing ample stopping power. ABS (Anti-lock Braking System) and electronic stability control are standard features, enhancing safety and control. The steering system is a rack-and-pinion setup with electric power assistance, offering precise and responsive steering feel.
Market Reception & Comparison
The BMW 420d xDrive Steptronic was generally well-received by automotive critics. It was praised for its fuel efficiency, comfortable ride, and refined interior. The xDrive all-wheel-drive system was also highlighted as a valuable feature, particularly in regions with inclement weather. Compared to the 420i, the 420d offered significantly better fuel economy and a broader torque curve, making it a more practical choice for long-distance driving. However, the 420i was often preferred by those who prioritized a more responsive and engaging driving experience. The 430i offered even more power and performance, but at a higher price point. In terms of reliability, the B47 engine has proven to be generally robust, although some owners have reported issues with the diesel particulate filter (DPF) and turbocharger.
Legacy
The BMW 420d xDrive Steptronic remains a popular choice in the used car market. Its combination of style, comfort, efficiency, and all-weather capability continues to appeal to buyers seeking a premium compact coupe. The B47 engine, while not without its potential issues, has proven to be relatively durable when properly maintained. Regular servicing, including oil changes and DPF regeneration, is crucial for ensuring long-term reliability. The 420d xDrive Steptronic represents a well-rounded and sophisticated package that offers a compelling alternative to its more expensive and performance-focused siblings.
