The Citroën C4 I Coupe, specifically the Phase II model produced between 2008 and 2010, represented a distinctive offering in the compact coupe market. This variant, powered by the 1.6 HDi 16V engine producing 90 horsepower, was positioned as an economical and practical choice within the C4 Coupe range. It sat below the more powerful petrol variants and the higher-output diesel options, targeting buyers prioritizing fuel efficiency and lower running costs. The C4 Coupe itself was a three-door hatchback, designed to appeal to those seeking a more stylish alternative to traditional five-door hatchbacks, and was built on the PSA Group’s Platform 2 (also known as the 1HX0/A3 platform) shared with the Peugeot 307.
Technical Specifications
| Brand | Citroën |
| Model | C4 |
| Generation | C4 I Coupe (Phase II, 2008) |
| Type (Engine) | 1.6 HDi 16V (90 Hp) FAP |
| Start of production | 2008 |
| End of production | 2010 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 5 |
| Doors | 3 |
| Fuel consumption (urban) | 6 l/100 km (39.2 US mpg, 47.1 UK mpg, 16.7 km/l) |
| Fuel consumption (extra urban) | 4 l/100 km (58.8 US mpg, 70.6 UK mpg, 25 km/l) |
| Fuel consumption (combined) | 4.7 l/100 km (50 US mpg, 60.1 UK mpg, 21.3 km/l) |
| CO2 emissions | 125 g/km |
| Fuel Type | Diesel |
| Acceleration 0 – 100 km/h | 12.5 sec |
| Acceleration 0 – 62 mph | 12.5 sec |
| Acceleration 0 – 60 mph | 11.9 sec |
| Maximum speed | 180 km/h (111.85 mph) |
| Emission standard | Euro 4 |
| Weight-to-power ratio | 14.2 kg/Hp, 70.4 Hp/tonne |
| Weight-to-torque ratio | 5.9 kg/Nm, 168.1 Nm/tonne |
| Power | 90 Hp @ 4000 rpm |
| Power per litre | 57.7 Hp/l |
| Torque | 215 Nm @ 1750 rpm (158.58 lb.-ft. @ 1750 rpm) |
| Engine layout | Front, Transverse |
| Engine Model/Code | 9HX DV6TED4 |
| Engine displacement | 1560 cm3 (95.2 cu. in.) |
| Number of cylinders | 4 |
| Engine configuration | Inline |
| Cylinder Bore | 75 mm (2.95 in.) |
| Piston Stroke | 88.3 mm (3.48 in.) |
| Compression ratio | 18:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Turbocharger, Intercooler |
| Valvetrain | DOHC |
| Engine oil capacity | 3.8 l (4.02 US qt | 3.34 UK qt) |
| Coolant | 6.5 l (6.87 US qt | 5.72 UK qt) |
| Kerb Weight | 1279 kg (2819.71 lbs.) |
| Max. weight | 1799 kg (3966.12 lbs.) |
| Max load | 520 kg (1146.4 lbs.) |
| Trunk (boot) space – minimum | 314 l (11.09 cu. ft.) |
| Trunk (boot) space – maximum | 1083 l (38.25 cu. ft.) |
| Fuel tank capacity | 60 l (15.85 US gal | 13.2 UK gal) |
| Max. roof load | 75 kg (165.35 lbs.) |
| Permitted trailer load with brakes (8%) | 1300 kg (2866.01 lbs.) |
| Permitted trailer load with brakes (12%) | 1300 kg (2866.01 lbs.) |
| Permitted trailer load without brakes | 677 kg (1492.53 lbs.) |
| Permitted towbar download | 66 kg (145.51 lbs.) |
| Length | 4288 mm (168.82 in.) |
| Width | 1769 mm (69.65 in.) |
| Width including mirrors | 1964 mm (77.32 in.) |
| Height | 1456 mm (57.32 in.) |
| Wheelbase | 2608 mm (102.68 in.) |
| Front track | 1497 mm (58.94 in.) |
| Rear (Back) track | 1502 mm (59.13 in.) |
| Front overhang | 950 mm (37.4 in.) |
| Rear overhang | 730 mm (28.74 in.) |
| Minimum turning circle (turning diameter) | 11.3 m (37.07 ft.) |
| 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 | 5 gears, manual transmission |
| Front suspension | Independent, type McPherson with coil spring and anti-roll bar |
| Rear suspension | Semi-independent, coil spring |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Tires size | 205/55 R16 |
| Wheel rims size | 16 |
Powertrain & Engine Architecture
The heart of this C4 Coupe variant is the 1.6 HDi 16V engine, identified by the code 9HX (part of the DV6 family). This engine is a four-cylinder, inline diesel utilizing a common rail direct injection system. The DV6 engine family was a mainstay for PSA Group (Peugeot and Citroën) for many years, known for its relatively simple design and fuel efficiency. The 16V designation refers to the four valves per cylinder, enhancing breathing and contributing to improved power output. A turbocharger with an intercooler is employed to boost performance, delivering 90 horsepower at 4000 rpm and 215 Nm (158.58 lb-ft) of torque at 1750 rpm. The engine features a relatively high compression ratio of 18:1, typical for diesel engines. The 5-speed manual transmission was the standard offering, chosen for its efficiency and cost-effectiveness.
Driving Characteristics
The 1.6 HDi 90 hp engine, paired with the 5-speed manual gearbox, provided adequate, though not exhilarating, performance. Acceleration from 0 to 100 km/h (0-62 mph) took around 12.5 seconds. The engine’s torque peak at 1750 rpm meant that it felt reasonably responsive in everyday driving situations, particularly for overtaking at lower speeds. However, compared to the more powerful petrol versions or the 110 hp HDi variant, the 90 hp model felt noticeably slower, especially when fully loaded or tackling inclines. The gear ratios were geared towards fuel economy, meaning the engine could feel strained at higher speeds.
Equipment & Trim Levels
The 1.6 HDi 90 hp variant of the C4 Coupe typically came with a reasonable level of standard equipment. This included power steering, central locking, electric front windows, and an audio system. Air conditioning was often an optional extra. Interior upholstery was typically cloth, with a functional, if not luxurious, dashboard layout. Higher trim levels, available at an additional cost, could add features such as alloy wheels, rear electric windows, and upgraded audio systems. Safety features included ABS brakes and driver/passenger airbags.
Chassis & Braking
The C4 Coupe’s chassis featured an independent McPherson strut suspension at the front and a semi-independent coil spring suspension at the rear. This setup provided a comfortable ride quality, although it wasn’t particularly sporty. The front brakes were ventilated discs, while the rear brakes were solid discs. The steering was a rack and pinion system, offering reasonable precision. The car’s weight of approximately 1279 kg (2819.71 lbs) contributed to its relatively modest performance.
Market Reception & Comparison
The Citroën C4 Coupe 1.6 HDi 90 hp was generally well-received as a practical and economical choice. Critics praised its fuel efficiency and low running costs, but noted its lack of outright performance. Compared to the 110 hp HDi variant, the 90 hp model offered lower purchase price and slightly better fuel economy, but at the expense of performance. Against petrol-powered rivals, the 1.6 HDi offered significantly better fuel economy, making it an attractive option for high-mileage drivers.
Legacy
The 1.6 HDi engine, in its various iterations, proved to be a reliable and durable powertrain. While not without its issues (such as potential problems with the diesel particulate filter – DPF – particularly on cars used primarily for short journeys), the engine generally offered good longevity with regular maintenance. Today, the C4 Coupe 1.6 HDi 90 hp can be found on the used car market at affordable prices. Its fuel efficiency and relatively low maintenance costs continue to make it an appealing option for budget-conscious buyers, although potential buyers should be aware of the potential for DPF-related issues and the age-related wear and tear common to vehicles of this era.
