The Citroën C4 X 1.2 (145 hp) Mild Hybrid e-DCS represents a unique offering within the C4 X lineup, launched as part of the Phase II update in March 2025. Positioned as a mid-range option, this variant blends fuel efficiency with a reasonable level of performance, targeting buyers seeking a comfortable and economical fastback crossover. The C4 X itself is a distinctive model, combining the elevated ride height of an SUV with the sleek profile of a saloon, aiming to bridge the gap between traditional body styles. It builds upon the CMP/e-CMP platform shared with the Peugeot 308 and Opel/Vauxhall Astra, but distinguishes itself with a more spacious interior and a focus on comfort. This particular 1.2-liter mild hybrid powertrain is a key component of Citroën’s strategy to offer electrified options across its range, appealing to increasingly environmentally conscious consumers.
Technical Specifications
| Brand | Citroen |
| Model | C4 X |
| Generation | C4 X (Phase II, 2024) |
| Type (Engine) | 1.2 (145 Hp) Mild Hybrid e-DCS |
| Start of production | March, 2025 |
| Powertrain Architecture | MHEV (Mild Hybrid Electric Vehicle) |
| Body type | SUV, Crossover, Fastback |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption at Low speed (WLTP) | 4.3 l/100 km (54.7 US mpg, 65.7 UK mpg, 23.3 km/l) |
| Fuel consumption at Medium speed (WLTP) | 4.2 l/100 km (56 US mpg, 67.3 UK mpg, 23.8 km/l) |
| Fuel consumption at high speed (WLTP) | 4.3 l/100 km (54.7 US mpg, 65.7 UK mpg, 23.3 km/l) |
| Fuel consumption at very high speed (WLTP) | 5.5 l/100 km (42.8 US mpg, 51.4 UK mpg, 18.2 km/l) |
| Combined fuel consumption (WLTP) | 4.7 l/100 km (50 US mpg, 60.1 UK mpg, 21.3 km/l) |
| CO2 emissions (WLTP) | 106 g/km |
| Fuel Type | Petrol (Gasoline) |
| Acceleration 0 – 100 km/h | 8.1 sec |
| Acceleration 0 – 62 mph | 8.1 sec |
| Acceleration 0 – 60 mph | 7.7 sec |
| Maximum speed | 210 km/h (130.49 mph) |
| Emission standard | Euro 6e |
| Weight-to-power ratio | 9.3 kg/Hp, 107.9 Hp/tonne |
| Weight-to-torque ratio | 5.8 kg/Nm, 171.1 Nm/tonne |
| Gross battery capacity | 0.89 kWh |
| Battery voltage | 48 V |
| Battery technology | Lithium-ion (Li-Ion) |
| Battery location | Under the front seats |
| Electric motor power | 21 Hp @ 4264 rpm |
| Electric motor Torque | 51 Nm (37.62 lb.-ft.) |
| Electric motor location | Integrated into the transmission |
| Electric motor type | Synchronous |
| System power | 145 Hp |
| System torque | 230 Nm @ 1750 rpm (169.64 lb.-ft. @ 1750 rpm) |
| Power | 136 Hp @ 5500 rpm |
| Torque | 230 Nm @ 1750 rpm (169.64 lb.-ft. @ 1750 rpm) |
| Engine layout | Front, Transverse |
| Engine Model/Code | HN09 |
| Engine displacement | 1199 cm3 (73.17 cu. in.) |
| Number of cylinders | 3 |
| Engine configuration | Inline |
| Cylinder Bore | 75 mm (2.95 in.) |
| Piston Stroke | 90.5 mm (3.56 in.) |
| Number of valves per cylinder | 4 |
| Fuel injection system | Direct injection |
| Engine aspiration | Turbocharger, Intercooler |
| Engine oil capacity | 3.5 l (3.7 US qt | 3.08 UK qt) |
| Kerb Weight | 1344-1414 kg (2963.01 – 3117.34 lbs.) |
| Max. weight | 1825 kg (4023.44 lbs.) |
| Max load | 411-481 kg (906.1 – 1060.42 lbs.) |
| Trunk (boot) space – minimum | 510 l (18.01 cu. ft.) |
| Fuel tank capacity | 50 l (13.21 US gal | 11 UK gal) |
| Permitted trailer load with brakes (12%) | 1200 kg (2645.55 lbs.) |
| Permitted trailer load without brakes | 700 kg (1543.24 lbs.) |
| Permitted towbar download | 61 kg (134.48 lbs.) |
| Length | 4580 mm (180.31 in.) |
| Width | 1800 mm (70.87 in.) |
| Width with mirrors folded | 1834 mm (72.2 in.) |
| Width including mirrors | 2032 mm (80 in.) |
| Height | 1525 mm (60.04 in.) |
| Wheelbase | 2670 mm (105.12 in.) |
| Front track | 1545-1560 mm (60.83 – 61.42 in.) |
| Rear (Back) track | 1545-1560 mm (60.83 – 61.42 in.) |
| Front overhang | 870 mm (34.25 in.) |
| Rear overhang | 1040 mm (40.94 in.) |
| Drivetrain Architecture | Front wheel drive. MHEV. ICE and electric motor drive the front wheels. |
| Drive wheel | Front wheel drive |
| Number of gears and type of gearbox | 6 gears, automatic transmission e-DCS |
| Front suspension | Independent, type McPherson with coil spring and anti-roll bar |
| Rear suspension | Coil spring, Torsion |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Tires size | 215/65 R16 98H; 195/60 R18 96H |
| Wheel rims size | 16; 18 |
Powertrain & Engine Architecture
At the heart of the C4 X 1.2 Mild Hybrid e-DCS lies the HN09, a 1.2-liter turbocharged three-cylinder petrol engine. This engine produces 136 horsepower at 5500 rpm and 230 Nm (169.64 lb-ft) of torque at 1750 rpm. The “Mild Hybrid” designation indicates the presence of a 48-volt electrical system and a small electric motor (21 hp and 51 Nm) integrated with the dual-clutch six-speed e-DCS automatic transmission. This system allows for regenerative braking, capturing energy during deceleration to recharge the 0.89 kWh lithium-ion battery located under the front seats. The electric motor provides a power boost during acceleration and enables a limited degree of electric-only driving under certain conditions, primarily at low speeds. The engine utilizes direct fuel injection and a turbocharger with an intercooler to enhance efficiency and power output. The e-DCS transmission is a key element, offering smooth and efficient gear changes, and contributing to the overall fuel economy.
Driving Characteristics
The 1.2-liter mild hybrid powertrain delivers a comfortable and refined driving experience. While not overtly sporty, the 145 hp combined system output provides adequate acceleration, achieving 0-60 mph in approximately 7.7 seconds. The e-DCS transmission is generally responsive, although some drivers may notice a slight hesitation during quick downshifts. The mild hybrid system effectively smooths out power delivery, and the electric assist is most noticeable during initial acceleration. Compared to higher-output versions of the C4 X, this variant prioritizes fuel economy over outright performance. The gear ratios are tuned for efficiency, resulting in a relaxed cruising experience. The steering is light and precise, making it easy to maneuver in urban environments.
Equipment & Trim Levels
The C4 X 1.2 Mild Hybrid e-DCS typically comes well-equipped, reflecting its mid-range positioning. Standard features often include a touchscreen infotainment system with Apple CarPlay and Android Auto compatibility, automatic climate control, rear parking sensors, and a suite of safety features such as automatic emergency braking and lane departure warning. Interior upholstery is typically cloth, with options for upgraded materials. Available optional extras may include a panoramic sunroof, adaptive cruise control, and a more advanced infotainment system with navigation. The trim level often dictates the exterior styling details, such as alloy wheel designs and chrome accents.
Chassis & Braking
The C4 X utilizes a McPherson strut front suspension and a torsion beam rear suspension. This setup provides a good balance between ride comfort and handling. The front brakes are ventilated discs, while the rear brakes are solid discs. ABS (Anti-lock Braking System) is standard, along with electronic stability control. The suspension is tuned to prioritize comfort, absorbing bumps and imperfections in the road surface effectively. Stabilizer bars are fitted to both the front and rear axles to reduce body roll during cornering.
Market Reception & Comparison
The Citroën C4 X 1.2 Mild Hybrid e-DCS has been generally well-received by critics for its fuel efficiency, comfortable ride, and distinctive styling. Compared to the more powerful petrol and diesel variants, this model offers a lower purchase price and reduced running costs. However, some reviewers have noted that the performance is not as exhilarating as that of the higher-output engines. In terms of fuel economy, the 1.2-liter mild hybrid consistently outperforms the petrol-only versions, and offers comparable economy to the diesel models while benefiting from lower NOx emissions.
Legacy
The long-term reliability of the HN09 engine and the e-DCS transmission remains to be fully established, but early reports suggest that the powertrain is generally robust. The mild hybrid system is relatively simple, reducing the potential for complex failures. On the used car market, the C4 X 1.2 Mild Hybrid e-DCS is expected to hold its value reasonably well, appealing to buyers seeking an economical and stylish crossover. Its combination of fuel efficiency, comfort, and practicality should ensure its continued popularity in the years to come.
