The BMW 1 Series Sedan (F52) 120i Steptronic, produced from February 2017 to 2019, represents BMW’s entry into the compact sedan market, primarily targeted towards regions where three-box sedans are favored over hatchbacks – notably China. Positioned as a more affordable and accessible variant within the F52 1 Series lineup, the 120i offered a balance between performance, efficiency, and BMW’s signature driving experience. It utilized the front-wheel-drive UKL2 platform, shared with the MINI range, marking a departure from the rear-wheel-drive layout traditionally associated with the 1 Series in Europe. This model aimed to broaden the 1 Series’ appeal and capture a larger segment of the global automotive market.
Technical Specifications
| Brand | BMW |
| Model | 1 Series |
| Generation | 1 Series Sedan (F52) |
| Type (Engine) | 120i (192 Hp) Steptronic |
| Start of production | February, 2017 |
| End of production | 2019 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (combined) | 6.4 l/100 km |
| Fuel consumption (US mpg) | 36.8 US mpg |
| Fuel consumption (UK mpg) | 44.1 UK mpg |
| Fuel consumption (km/l) | 15.6 km/l |
| CO2 emissions | 147.9 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 7.5 sec |
| Acceleration 0 – 62 mph | 7.5 sec |
| Acceleration 0 – 60 mph | 7.1 sec |
| Maximum speed | 235 km/h (146.02 mph) |
| Power | 192 Hp @ 5000-6000 rpm |
| Power per litre | 96.1 Hp/l |
| Torque | 280 Nm @ 1350-4600 rpm (206.52 lb.-ft. @ 1350-4600 rpm) |
| Engine layout | Front, Transverse |
| Engine Model/Code | B48A20M0 |
| Engine displacement | 1998 cm3 (121.93 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Cylinder Bore | 82 mm (3.23 in.) |
| Piston Stroke | 94.6 mm (3.72 in.) |
| Compression ratio | 11:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Twin-power turbo, Intercooler |
| Engine oil capacity | 5.3 l (5.6 US qt | 4.66 UK qt) |
| Fuel tank capacity | 50 l (13.21 US gal | 11 UK gal) |
| Length | 4456 mm (175.43 in.) |
| Width | 1803 mm (70.98 in.) |
| Height | 1446 mm (56.93 in.) |
| Wheelbase | 2670 mm (105.12 in.) |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives the front wheels of the vehicle. |
| Drive wheel | Front wheel drive |
| Number of gears and type of gearbox | 8 gears, automatic transmission Steptronic |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
Powertrain & Engine Architecture
The heart of the 120i Steptronic is BMW’s B48A20M0 2.0-liter inline-four cylinder engine. This engine is part of BMW’s modular engine family, known for its efficiency and performance. It features direct fuel injection, a single twin-scroll turbocharger, and variable valve timing (VANOS) on both intake and exhaust sides. The turbocharger is crucial for providing a broad torque curve and responsive acceleration. The engine produces 192 horsepower at 5000-6000 rpm and 280 Nm (206.52 lb-ft) of torque between 1350 and 4600 rpm. This torque band allows for strong pulling power in everyday driving situations.
The “Steptronic” designation refers to BMW’s 8-speed automatic transmission. This transmission is known for its smooth shifts and intelligent programming. It adapts to the driver’s style and road conditions, optimizing gear selection for efficiency or performance. The transmission also features a manual shift mode, allowing drivers to take more control. Unlike some competitors, the 120i Steptronic does not offer a traditional torque converter lock-up in all gears, prioritizing smoothness over ultimate efficiency in certain scenarios.
Driving Characteristics
The 120i Steptronic delivers a comfortable and refined driving experience. While not as overtly sporty as some of its higher-powered siblings, the 192 hp engine provides adequate performance for most driving situations. Acceleration from 0-60 mph takes approximately 7.1 seconds. The 8-speed automatic transmission contributes to a relaxed cruising experience, keeping engine speeds low at highway speeds. Compared to a manual transmission equipped 120i (where available in other markets), the Steptronic version prioritizes ease of use and convenience over outright driver engagement. The front-wheel-drive configuration provides good traction in most conditions, but it doesn’t offer the balanced handling characteristics of BMW’s traditional rear-wheel-drive setup.
Equipment & Trim Levels
The 120i Steptronic typically came standard with features such as automatic climate control, a 6.5-inch infotainment system with iDrive controller, power windows and locks, and a basic audio system. Upholstery was generally cloth, although leatherette or full leather options were available as upgrades. Optional extras included a larger infotainment screen, navigation system, premium audio, parking sensors, and various driver-assistance systems like lane departure warning and automatic emergency braking. Trim levels varied by market, but generally, the 120i represented the entry point into the 1 Series Sedan range, with higher trims like the 125i and 130i offering more luxurious appointments and performance upgrades.
Chassis & Braking
The F52 1 Series Sedan utilizes a MacPherson strut front suspension and a multi-link rear suspension. This setup provides a good balance between ride comfort and handling. The 120i typically featured smaller diameter wheels and tires compared to the higher-performance models, contributing to a more comfortable ride. Braking duties are handled by ventilated discs at the front and solid discs at the rear. Anti-lock braking system (ABS) is standard, along with electronic brake-force distribution (EBD). Stabilizer bars are present at both the front and rear to reduce body roll during cornering, although the thickness of these bars is typically less than those found on the more powerful variants.
Market Reception & Comparison
The 120i Steptronic was generally well-received as a practical and efficient entry-level luxury sedan. Critics praised its comfortable ride, refined interior, and fuel economy. However, some reviewers noted that the engine lacked the outright punch of its more powerful counterparts. Compared to the 125i and 130i models, the 120i offered a more affordable price point but sacrificed some performance. In terms of fuel economy, the 120i Steptronic typically achieved around 36.8 US mpg combined, making it a relatively efficient option in its class. Reliability reports suggest that the B48 engine is generally robust, although regular maintenance is crucial to prevent issues.
Legacy
The BMW 1 Series Sedan (F52) 120i Steptronic, while not a performance icon, played a significant role in expanding the 1 Series’ reach into new markets. The B48 engine has proven to be a reliable and versatile powerplant, continuing to be used in various BMW models. On the used car market, the 120i Steptronic represents a relatively affordable entry point into BMW ownership. Its combination of comfort, efficiency, and BMW branding makes it an attractive option for buyers seeking a practical and well-equipped compact sedan. However, potential buyers should be aware of the front-wheel-drive configuration and ensure that the vehicle has been properly maintained.
