The Mercedes-Benz C-Class Cabriolet (A205) C 250d 9G-TRONIC, produced from 2016 to 2018, represented a compelling blend of luxury, performance, and fuel efficiency within the C-Class range. Positioned as a mid-range offering in the Cabriolet lineup, it catered to buyers seeking a refined open-top experience without the higher price tag of the more powerful AMG variants. This model combined a potent four-cylinder diesel engine with Mercedes-Benz’s sophisticated 9G-TRONIC automatic transmission, offering a comfortable and capable grand touring experience. It was primarily marketed towards European and international markets where diesel engines remained popular due to their fuel economy and torque characteristics.
Technical Specifications
| Brand | Mercedes-Benz |
| Model | C-class |
| Generation | C-class Cabriolet (A205) |
| Type (Engine) | C 250d (204 Hp) 9G-TRONIC |
| Start of production | 2016 |
| End of production | 2018 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Cabriolet |
| Seats | 4 |
| Doors | 2 |
| Fuel consumption (urban) | 5.4-5.2 l/100 km (43.6 – 45.2 US mpg, 52.3 – 54.3 UK mpg, 18.5 – 19.2 km/l) |
| Fuel consumption (extra urban) | 4.5-4.3 l/100 km (52.3 – 54.7 US mpg, 62.8 – 65.7 UK mpg, 22.2 – 23.3 km/l) |
| Fuel consumption (combined) | 4.9-4.6 l/100 km (48 – 51.1 US mpg, 57.6 – 61.4 UK mpg, 20.4 – 21.7 km/l) |
| CO2 emissions | 124-121 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 |
| Emission standard | Euro 6 |
| Weight-to-power ratio | 8.7 kg/Hp, 115.3 Hp/tonne |
| Weight-to-torque ratio | 3.5 kg/Nm, 282.5 Nm/tonne |
| Power | 204 Hp @ 3800 rpm |
| Power per litre | 95.2 Hp/l |
| Torque | 500 Nm @ 1600-1800 rpm (368.78 lb.-ft. @ 1600-1800 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | OM 651.921 |
| Engine displacement | 2143 cm3 (130.77 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Compression ratio | 16.2:1 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | BiTurbo, Intercooler |
| Engine oil capacity | 6 l (6.34 US qt | 5.28 UK qt) |
| Kerb Weight | 1770 kg (3902.18 lbs.) |
| Max. weight | 2250 kg (4960.4 lbs.) |
| Max load | 480 kg (1058.22 lbs.) |
| Trunk (boot) space – minimum | 285 l (10.06 cu. ft.) |
| Trunk (boot) space – maximum | 360 l (12.71 cu. ft.) |
| Fuel tank capacity | 50 l (13.21 US gal | 11 UK gal) |
| Permitted trailer load with brakes (12%) | 1800 kg (3968.32 lbs.) |
| Permitted trailer load without brakes | 750 kg (1653.47 lbs.) |
| Length | 4686 mm (184.49 in.) |
| Width | 1810 mm (71.26 in.) |
| Width including mirrors | 2016 mm (79.37 in.) |
| Height | 1409 mm (55.47 in.) |
| Wheelbase | 2840 mm (111.81 in.) |
| Front track | 1563 mm (61.54 in.) |
| Rear (Back) track | 1546 mm (60.87 in.) |
| Front overhang | 790 mm (31.1 in.) |
| Rear overhang | 1056 mm (41.57 in.) |
| Drag coefficient (Cd) | 0.29 |
| Minimum turning circle (turning diameter) | 11.22 m (36.81 ft.) |
| Drivetrain Architecture | Rear wheel drive |
| Drive wheel | Rear wheel drive |
| Number of gears and type of gearbox | 9 gears, automatic transmission G-TRONIC |
| Front suspension | Independent multi-link suspension |
| Rear suspension | Independent multi-link suspension |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
| Tires size | 225/50 R17 |
| Wheel rims size | 17 |
INTRODUCTION
The A205 C-Class Cabriolet, launched in 2016, brought open-top motoring back to the C-Class range after a 12-year hiatus. The C 250d 9G-TRONIC variant was a key model in the lineup, offering a balance between performance and economy. Built on the W205 C-Class platform, the Cabriolet shared its mechanical underpinnings with the sedan and coupe, but featured a fabric soft top and reinforced chassis for increased rigidity. This model aimed to appeal to buyers who desired a stylish and comfortable convertible without sacrificing the practicality and refinement expected from a Mercedes-Benz.
Powertrain & Engine Architecture
The C 250d Cabriolet was powered by the OM 651.921, a 2.1-liter inline-four cylinder diesel engine. This engine was a mainstay in the Mercedes-Benz lineup, known for its robust construction and fuel efficiency. It featured a sophisticated common-rail direct injection system, delivering fuel at extremely high pressures for optimized combustion. The engine also employed a twin-turbocharger setup – a smaller turbo for quick response at low engine speeds and a larger turbo for increased power at higher RPMs. The 9G-TRONIC nine-speed automatic transmission was a crucial component, offering smooth and efficient gear changes. This transmission featured a wide gear ratio spread, contributing to both fuel economy and responsive acceleration. The transmission’s computer control unit adapted shift patterns based on driving style and road conditions.
Driving Characteristics
The C 250d 9G-TRONIC provided a relaxed and refined driving experience. While not overtly sporty, the engine delivered ample torque – 500 Nm (368.78 lb.-ft.) – from as low as 1600 rpm, providing strong acceleration in everyday driving situations. The 9G-TRONIC transmission helped keep the engine in its optimal power band, resulting in effortless cruising. Compared to the C 300 Cabriolet with its gasoline engine, the C 250d offered superior fuel economy and a more relaxed power delivery. However, it lacked the outright punch and responsiveness of the petrol variant. The automatic transmission, while smooth, could sometimes feel hesitant during quick downshifts. The Cabriolet’s suspension provided a comfortable ride, absorbing bumps and imperfections in the road effectively, though it wasn’t as focused on handling as the coupe version.
Equipment & Trim Levels
The C 250d Cabriolet came standard with a generous array of features, including leather upholstery, automatic climate control, a multi-function steering wheel, and a high-resolution infotainment system with a central display screen. Standard safety equipment included ABS, ESP, and multiple airbags. Optional extras included features like a premium sound system, navigation system, heated seats, and advanced driver-assistance systems such as lane keeping assist and adaptive cruise control. Interior trim options allowed for personalization, with choices in wood, aluminum, and carbon fiber finishes. The Cabriolet also offered a range of exterior color options and wheel designs.
Chassis & Braking
The A205 Cabriolet’s chassis was reinforced compared to the coupe and sedan to compensate for the lack of a fixed roof. This included additional bracing in the sills and underbody. The suspension utilized a four-link front axle and a multi-link rear axle, providing a comfortable and controlled ride. The C 250d was equipped with ventilated front disc brakes and solid rear discs. ABS (Anti-lock Braking System) was standard, ensuring safe and effective braking performance. The steering system was a rack-and-pinion setup with electric power assistance, offering precise and responsive steering feel.
Market Reception & Comparison
The C 250d Cabriolet was generally well-received by automotive critics. It was praised for its comfortable ride, refined interior, and fuel-efficient engine. Reviewers noted that the diesel engine provided ample power for most driving situations, and the 9G-TRONIC transmission contributed to a smooth and relaxed driving experience. Compared to the C 300 Cabriolet, the C 250d offered better fuel economy and lower running costs, making it a more practical choice for those who prioritized efficiency. However, some critics found the diesel engine to be somewhat noisy and lacking the refinement of the petrol engine.
Legacy
The Mercedes-Benz C-Class Cabriolet (A205) C 250d 9G-TRONIC has proven to be a reliable and durable vehicle. The OM 651 diesel engine is known for its longevity, and the 9G-TRONIC transmission has also demonstrated good reliability. On the used car market, these models remain popular due to their combination of luxury, comfort, and fuel efficiency. Regular maintenance, including oil changes and filter replacements, is crucial for ensuring the long-term health of the engine and transmission. While diesel emissions regulations have become stricter in recent years, the C 250d remains a viable option for buyers seeking a refined and economical open-top experience.
