The BMW 4 Series Coupe (F32) 420d Steptronic, produced from 2015 to 2016, represents a compelling entry point into the premium coupe market. Positioned as a diesel-powered variant within the F32 generation, it aimed to deliver a balance of performance, efficiency, and luxury. This model occupied the lower-mid range of the 4 Series lineup, slotting below the more powerful 420i, 430i, and 440i gasoline variants, as well as the higher-torque 435d. The 420d Steptronic was primarily marketed towards drivers seeking a refined and economical grand tourer, offering a sophisticated driving experience with BMW’s renowned handling characteristics.
Technical Specifications
| Brand | BMW |
| Model | 4 Series |
| Generation | 4 Series Coupe (F32) |
| Type (Engine) | 420d (190 Hp) Steptronic |
| Start of production | 2015 |
| End of production | 2016 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (urban) | 4.7-5.1 l/100 km (50 – 46.1 US mpg, 60.1 – 55.4 UK mpg, 21.3 – 19.6 km/l) |
| Fuel consumption (extra urban) | 3.6-3.9 l/100 km (65.3 – 60.3 US mpg, 78.5 – 72.4 UK mpg, 27.8 – 25.6 km/l) |
| Fuel consumption (combined) | 4.0-4.3 l/100 km (58.8 – 54.7 US mpg, 70.6 – 65.7 UK mpg, 25 – 23.3 km/l) |
| CO2 emissions | 106-114 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 | 232 km/h (144.16 mph) |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 7.9 kg/Hp, 126.7 Hp/tonne |
| Weight-to-torque ratio | 3.8 kg/Nm, 266.7 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 | 1500 kg (3306.93 lbs.) |
| Max. weight | 2020 kg (4453.34 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 |
| 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 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 |
INTRODUCTION
The BMW 420d Coupe (F32) Steptronic, launched in 2015, is a rear-wheel-drive, two-door coupe powered by a 2.0-liter turbocharged diesel engine. It’s built on the F32 platform, which also underpins the 4 Series Gran Coupe and Convertible models. This variant aimed to provide a more accessible entry point into the 4 Series range, appealing to buyers who prioritized fuel efficiency and comfortable long-distance cruising over outright performance. The Steptronic designation indicates the inclusion of BMW’s eight-speed automatic transmission.
Powertrain & Engine Architecture
At the heart of the 420d Steptronic lies the BMW B47D20A engine, a 2.0-liter inline-four cylinder diesel. This engine utilizes a common-rail direct injection system, delivering fuel at extremely high pressure for optimized combustion. A twin-scroll turbocharger with variable geometry turbine (VGT) technology enhances both low-end torque and overall power output. The engine also features an intercooler to further cool the intake air, increasing density and efficiency. The B47 engine is known for its relatively quiet operation and refined power delivery. The eight-speed Steptronic automatic transmission is a torque-converter type, offering smooth and quick shifts. It features adaptive shift programs that adjust to the driver’s style and road conditions. Manual shift control is also available via steering wheel-mounted paddles or the gear selector.
Driving Characteristics
The 420d Steptronic delivers a comfortable and composed driving experience. While not as overtly sporty as its gasoline-powered siblings, it provides ample torque for effortless acceleration and overtaking. The 400 Nm (295 lb-ft) of torque, available from 1750-2500 rpm, provides strong pull in everyday driving situations. The eight-speed automatic transmission is well-matched to the engine, keeping the engine within its optimal power band. Compared to the six-speed manual transmission available on other 4 Series models, the Steptronic offers smoother shifts and reduced driver fatigue, particularly in stop-and-go traffic. However, some enthusiasts may find the automatic transmission less engaging than a manual gearbox. The rear-wheel-drive configuration contributes to the car’s balanced handling, although it requires more careful throttle control in slippery conditions.
Equipment & Trim Levels
The 420d Steptronic typically came equipped with a generous level of standard features. These included automatic climate control, power-adjustable front seats, a BMW iDrive infotainment system with a 6.5-inch display screen, and a leather-wrapped steering wheel. Standard safety features included ABS, stability control, and multiple airbags. Optional extras included a larger iDrive screen, navigation system, premium sound system, heated seats, and a sunroof. Interior upholstery was typically cloth or leatherette, with full leather options available at an extra cost. Trim levels varied depending on the market, but generally offered a range of cosmetic enhancements and additional features.
Chassis & Braking
The 420d Steptronic utilizes a sophisticated chassis design. The front suspension features independent coil springs and struts, while the rear suspension employs an independent multi-link setup. This configuration provides a good balance of ride comfort and handling precision. The car is equipped with ventilated disc brakes on all four wheels, providing ample stopping power. Anti-lock braking system (ABS) and electronic stability control (ESC) are standard features, enhancing safety and control. The steering system is a rack-and-pinion type with electric power assistance, offering precise and responsive steering feel.
Market Reception & Comparison
The 420d Steptronic was generally well-received by automotive critics. It was praised for its fuel efficiency, comfortable ride, and refined driving experience. However, some reviewers noted that the engine lacked the outright performance of its gasoline-powered counterparts. Compared to the 420i, the 420d offered significantly better fuel economy but less horsepower. The 435d, with its larger six-cylinder engine, provided considerably more torque and acceleration, but at a higher price point. The 420d Steptronic appealed to buyers who prioritized practicality and economy over all-out performance.
Legacy
The BMW B47 engine, found in the 420d Steptronic, has proven to be a relatively reliable powertrain. While some early examples experienced issues with timing chain tensioners, these were largely addressed with updated parts. The eight-speed Steptronic transmission is also known for its durability. Today, used examples of the 420d Steptronic offer a compelling value proposition, providing a luxurious and efficient coupe experience at a reasonable price. However, potential buyers should ensure that the car has been properly maintained and that any known issues have been addressed. The 420d Steptronic remains a popular choice for those seeking a refined and economical grand tourer.
