Technical Specifications
| Brand | BMW |
| Model | 4 Series |
| Generation | 4 Series Coupe (F32) |
| Type (Engine) | 420d (184 Hp) Steptronic |
| Start of production | 2013 |
| End of production | 2015 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (urban) | 5.6 – 5.4 l/100 km (42 – 43.6 US mpg) |
| Fuel consumption (extra urban) | 4.2 – 4.1 l/100 km (56 – 57.4 US mpg) |
| Fuel consumption (combined) | 4.7 – 4.6 l/100 km (50 – 51.1 US mpg) |
| 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 | 232 km/h (144.16 mph) |
| Weight-to-power ratio | 8.4 kg/Hp, 119.5 Hp/tonne |
| Weight-to-torque ratio | 4.1 kg/Nm, 246.8 Nm/tonne |
| Power | 184 Hp @ 4000 rpm |
| Torque | 380 Nm @ 1750-2500 rpm (280.27 lb.-ft. @ 1750-2500 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | N47D20C |
| 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 | Turbocharger, Intercooler |
| Engine oil capacity | 5.2 l (5.49 US qt | 4.58 UK qt) |
| Coolant capacity | 7 l (7.4 US qt | 6.16 UK qt) |
| Kerb Weight | 1540 kg (3395.12 lbs.) |
| Max. weight | 1985 kg (4376.18 lbs.) |
| Max load | 445 kg (981.06 lbs.) |
| Fuel tank capacity | 57 l (15.06 US gal | 12.54 UK gal) |
| 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 track | 1594 mm (62.76 in.) |
| Drivetrain Architecture | Rear wheel drive |
| Number of gears | 8 |
| Gearbox type | Automatic transmission Steptronic |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Tire size | 225/50 R17 94W |
| Wheel rims size | 7.5J x 17 |
The BMW 4 Series Coupe (F32) 420d Steptronic, produced between 2013 and 2015, served as the entry point into BMW’s 4 Series coupe lineup. It was designed to offer a balance of efficiency and respectable performance, appealing to buyers seeking a stylish, premium coupe with lower running costs. This model played a crucial role in BMW’s strategy to broaden the 4 Series’ appeal, directly competing with vehicles like the Audi A5 Coupe and Mercedes-Benz C-Class Coupe. The F32 chassis, shared with the broader F30 3 Series family, provided a solid foundation for the coupe’s sporty handling characteristics.
Powertrain & Engine Architecture
The 420d Steptronic is powered by the BMW N47D20C, a 2.0-liter inline-four cylinder diesel engine. This engine belongs to BMW’s renowned N47 family, celebrated for its efficiency and refinement. The N47D20C incorporates a second-generation common rail direct injection system, capable of delivering fuel at pressures up to 1800 bar for optimized combustion. A single turbocharger equipped with a variable geometry turbine (VGT) enhances performance, generating 380 Nm (280 lb-ft) of torque between 1750 and 2500 rpm. The engine features 16 valves (four per cylinder) and utilizes a timing chain. The “Steptronic” designation refers to BMW’s 8-speed automatic gearbox, known for its smooth gear changes and contribution to fuel economy. This transmission is integral to maximizing the engine’s efficiency and providing a comfortable driving experience.
Driving Characteristics
The 420d Steptronic delivers a comfortable and refined driving experience, prioritizing fuel efficiency over outright performance. While the 184 horsepower output is sufficient for everyday driving, it doesn’t offer the same level of acceleration as the 428i or 435i models. The 0-60 mph time of approximately 6.9 seconds is respectable, but the engine excels in highway cruising. The 8-speed automatic transmission is intelligently programmed, providing smooth and timely gear changes. Compared to the 6-speed manual transmission offered on some 420d models, the Steptronic provides greater convenience, especially in city traffic. However, the manual transmission offers a more engaging experience for driving enthusiasts. The rear-wheel-drive configuration contributes to balanced handling, though it requires careful throttle control in adverse weather conditions.
Equipment & Trim Levels
The 420d Steptronic typically came standard with features like automatic climate control, BMW’s iDrive infotainment system with a 6.5-inch display, power-adjustable front seats, and leather upholstery. Popular optional extras included a larger iDrive screen, navigation, heated seats, a sunroof, and upgraded audio systems. The Sport Line trim package added exterior styling enhancements, sport seats, and unique interior trim. The Luxury Line offered a more opulent interior with wood trim and chrome accents. The Modern Line focused on a contemporary aesthetic with satin aluminum trim and exclusive upholstery options.
Chassis & Braking
The F32 4 Series Coupe boasts a sophisticated chassis design featuring a multi-link rear suspension. The 420d generally utilized ventilated front disc brakes and solid disc brakes at the rear. Standard safety features included anti-lock brakes (ABS), dynamic stability control (DSC), and traction control. The suspension was tuned to strike a balance between comfort and handling, providing a relatively compliant ride without compromising agility. The steering is precise and well-weighted, offering good feedback to the driver. The 420d’s lighter weight compared to its higher-powered counterparts contributes to its nimble handling.
Market Reception & Comparison
The 420d Steptronic was generally well-received by automotive critics, who praised its fuel efficiency, comfortable ride, and stylish design. However, some reviewers noted that the engine lacked the power of its more potent siblings. Compared to the 428i, the 420d offered significantly better fuel economy but slower acceleration. The 420d was also more affordable to purchase and insure, making it an attractive option for budget-conscious buyers. When compared to competitors like the Audi A5 Coupe 2.0 TDI and Mercedes-Benz C220 CDI, the 420d presented a compelling combination of performance, efficiency, and luxury.
Legacy
The N47D20C engine, while generally reliable, has been known to experience issues with timing chain wear and glow plug failures. Consistent maintenance, including regular oil changes and timing chain inspections, is crucial for ensuring the engine’s longevity. The 8-speed Steptronic transmission has proven to be a durable and dependable unit. Today, the F32 420d Steptronic represents a relatively affordable entry point into BMW coupe ownership. Well-maintained examples continue to provide a stylish and efficient driving experience, making them a popular choice in the used car market. Its blend of practicality and premium features ensures its continued appeal to buyers seeking a refined and economical coupe.
