The BMW 4 Series Coupe (F32) 420d, powered by a 190 horsepower diesel engine, was a key variant in BMW’s lineup from 2015 to 2016. Positioned as a blend of performance and efficiency, the 420d aimed to attract buyers seeking a premium coupe experience without the higher running costs associated with more powerful engines. It occupied a mid-range position within the F32 4 Series, slotting below the 430d and 440i models, and above the base 420i. This model represented BMW’s continued commitment to diesel technology in the European market, offering a compelling alternative to gasoline-powered options.
Technical Specifications
| Brand | BMW |
| Model | 4 Series |
| Generation | 4 Series Coupe (F32) |
| Type (Engine) | 420d (190 Hp) |
| Start of production | 2015 |
| End of production | 2016 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (urban) | 5.1-5.5 l/100 km (46.1 – 42.8 US mpg) |
| Fuel consumption (extra urban) | 3.7-3.9 l/100 km (63.6 – 60.3 US mpg) |
| Fuel consumption (combined) | 4.2-4.5 l/100 km (56 – 52.3 US mpg) |
| CO2 emissions | 111-119 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 7.3 sec |
| Acceleration 0 – 62 mph | 7.3 sec |
| Acceleration 0 – 60 mph | 6.9 sec |
| Maximum speed | 240 km/h (149.13 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 7.8 kg/Hp, 128.8 Hp/tonne |
| Weight-to-torque ratio | 3.7 kg/Nm, 271.2 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 | 1475 kg (3251.82 lbs.) |
| Max. weight | 1995 kg (4398.22 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 | 745 kg (1642.44 lbs.) |
| Permitted towbar download | 75 kg (165.35 lbs.) |
| Length | 4638 mm (182.6 in.) |
| Width | 1825 mm (71.85 in.) |
| Height | 1377 mm (54.21 in.) |
| Wheelbase | 2810 mm (110.63 in.) |
| Front track | 1545 mm (60.83 in.) |
| Rear (Back) track | 1594 mm (62.76 in.) |
| Ride height (ground clearance) | 130 mm (5.12 in.) |
| Drag coefficient (Cd) | 0.28 |
| Minimum turning circle (turning diameter) | 11.3 m (37.07 ft.) |
| Drivetrain Architecture | Rear wheel drive |
| Drive wheel | Rear wheel drive |
| Number of gears and type of gearbox | 6 gears, manual transmission |
| 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 94V; 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 |
Powertrain & Engine Architecture
The heart of the 420d 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. The B47 utilizes a common-rail direct injection system, delivering fuel at extremely high pressures for optimized combustion. A twin-scroll turbocharger, coupled with an intercooler, provides a significant boost in power and torque. The engine also features variable valve timing (VANOS) and variable turbine geometry (VTG) on the turbocharger, further enhancing its responsiveness and efficiency. The 420d was typically paired with a six-speed manual transmission, although an eight-speed automatic transmission (ZF 8HP) was also available as an option. The automatic transmission contributed to improved fuel economy and smoother gear changes.
Driving Characteristics
The 420d offered a balanced driving experience. While not as overtly sporty as the higher-powered 4 Series variants, it provided ample torque for everyday driving and confident highway cruising. The 400 Nm (295 lb-ft) of torque, available from 1750-2500 rpm, meant strong acceleration in most situations. The six-speed manual transmission offered a direct and engaging feel, while the optional eight-speed automatic provided seamless shifts and improved fuel efficiency. Compared to the 420i, the 420d offered superior fuel economy and a broader torque curve, making it more relaxed to drive. However, the 420i generally felt more responsive at higher engine speeds. The 420d was noticeably less powerful than the 430d and 440i, which offered significantly more performance for those prioritizing outright speed.
Equipment & Trim Levels
The 420d Coupe came standard with a respectable level of equipment, including automatic climate control, BMW’s iDrive infotainment system with a 6.5-inch display, power-adjustable front seats, and a leather-wrapped steering wheel. Optional extras included a larger 8.8-inch iDrive screen with navigation, a premium sound system, heated front seats, and a sunroof. Interior upholstery options typically included cloth or leatherette, with full leather available as an upgrade. Trim levels varied depending on the market, but generally included Sport, Luxury, and M Sport packages, each adding unique styling cues and additional features.
Chassis & Braking
The F32 4 Series Coupe featured a sophisticated chassis design. It utilized an aluminum multi-link rear suspension, contributing to precise handling and a comfortable ride. The front suspension employed coil springs and independent control arms. The 420d typically came equipped with ventilated disc brakes on all four wheels, providing ample stopping power. Anti-lock braking system (ABS) and electronic stability control (ESC) were standard safety features. The weight distribution was carefully balanced, enhancing the car’s agility and responsiveness. The standard tire size was 225/50 R17, with larger sizes available as options.
Market Reception & Comparison
The 420d was generally well-received by automotive critics. It was praised for its fuel efficiency, comfortable ride, and refined engine. However, some reviewers noted that the engine could feel slightly strained when pushed hard. Compared to other diesel coupes in its class, the 420d offered a compelling combination of performance, economy, and luxury. Its fuel economy figures were particularly impressive, making it an attractive option for drivers covering long distances. Reliability reports generally indicated good long-term dependability, although diesel particulate filter (DPF) issues could occur with infrequent long-distance driving.
Legacy
The BMW 4 Series Coupe (F32) 420d has proven to be a durable and reliable vehicle in the used car market. The B47 engine, while having some known issues with timing chain wear in earlier iterations, has generally proven robust when properly maintained. The 420d remains a popular choice for buyers seeking a stylish and efficient coupe. Its blend of performance, economy, and BMW’s renowned driving dynamics continues to appeal to a wide range of drivers. The availability of affordable parts and a well-established service network further contribute to its enduring appeal.
