2007 Citroen C4

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Looking beyond styling and space, the C4 is designed to bring customers a more relaxed drive. The engines, running gear and many driving aids considerably enhance on-board comfort. In all these areas, the on-board technology works with the driver and passengers to set new standards in driveability and safety in this segment.

The C4 is the first Citroën vehicle to be produced at the Mulhouse production site. Over the past five years, the Marque has invested heavily to develop the plant’s industrial infrastructure and to upgrade platform 2.

A wide range of advanced technology powerplants

The C4 is available with a wide choice of new-generation engines. It offers a choice of five petrol engines: the 1.4i 16V (90 bhp DIN), the 1.6i 16V (110 bhp DIN), the 2.0i 16V (138 bhp DIN), the new 2.0i 16V (143 bhp DIN) recently introduced on the C5 and available with the C4 Hatchback and the 2.0i 16V (180 bhp DIN), installed on a Citroën vehicle – the C4 Coupé – for the first time. The three HDi diesel engines available with the C4 are all equipped with second-generation common-rail. The HDi 92 is making its debut on a PSA Peugeot Citroën Group vehicle, while the new HDi 110 and HDi 138 engines were recently introduced in the Citroën range.

Most of these engines already satisfy the Euro IV emission standard. With the C4, Citroën is also expanding the range of vehicles equipped with the diesel particulate filter system (DPFS). This technology rounds out the benefits of HDi engines in the field of environmental protection.

Exceptionally polished road manners

The C4 boasts impeccable road manners, with its MacPherson type suspension at the front and flexible transverse beam at the rear, associated with ABS, emergency braking assistance and ESP.
The braking system is among the best in the segment, with finely regulated ABS and ESP.

Modern, innovative equipment for relaxed drive

The C4 features a range of modern, efficient driving aids designed for easy, relaxed driving.

The lane departure warning system (LDWS) is a major step forward in driving safety. At speeds of over 80 kph, this system warns the driver if the car crosses a continuous or broken lane marking, if the indicator has not been activated. A vibrating mechanism mounted in the car seat is triggered on the side corresponding to the direction of vehicle drift, enabling the driver – who may have suffered a moment’s distraction – to take corrective action in time.

Xenon dual-function, directional headlamps (dipped and full beam), generally reserved for vehicles further up the market, provide improved lighting for cornering.

The C4 also features equipment more rarely found in this segment, such as a speed limiter, cruise control, front and rear parking assistance with manoeuvres displayed on the multifunction screen, and a low tyre-pressure warning system.

New features for protecting passengers and pedestrians

The C4 passed EuroNCAP crash tests with flying colours, taking 5 stars and 35 points out of a possible maximum of 37. The C4 also becomes the standard in pedestrian impact tests with a score of three stars, along with four stars for child protection. With its array of equipment and features, the C4 sets high standards in active and passive safety.

In particular, the C4 boasts the world’s first anatomically shaped driver airbag. This feature, which uses the fixed central section of the steering wheel, improves driver protection.

The C4 is also designed to protect pedestrians in the event of frontal impact. The vehicle is designed to limit the consequences of possible pedestrian impact (impact absorbers on the upper and lower part of the front end, aluminium bonnet with an inner panel perforated in the centre to absorb energy more effectively, etc.).

A new expression of onboard comfort

The interior design of the C4 places the emphasis on relaxation, with:

• discreet, high-tech interior styling, reflected in the understated dashboard design,
• innovations for simplicity of use and ergonomics.

For example, the multifunctional fixed-centred controls steering wheel brings the main comfort functions (audio system, telephone, etc.) and driving aids (speed limiter, cruise control, etc.) within easy reach. This ergonomic feature, which places the emphasis on easy-to-use controls, promotes driving pleasure.

The steering wheel is associated with an instrument cluster of new design, which displays driving information (vehicle speed, speed limiter and cruise control settings, etc.) on a translucent strip in the centre of the dashboard. The display contrast adjusts instantly to ambient light conditions to ensure a clear read-out at all times.

All these advanced functions create a relaxed atmosphere in the passenger compartment, further enhanced by the scented air freshener styled to match the interior, and the laminated side windows for acoustic comfort. In terms of practical features, the C4 features a host of stowage compartments including a boot foldaway partition to hold objects firmly in place.

A coupe and a hatchback different styles, same interior space

The C4 Hatchback and the C4 Coupé each have their own distinctive style. However, they share the same generous interior space, contributing to the comfort of the passenger compartment.

The hatchback has rounded forms, while the coupé favours a sharper line. Both vehicles share smooth, fluid lines for outstanding aerodynamics, one of Citroën’s traditional strengths (Cd of 0.28 for the coupé and 0.29 for the hatchback). The two vehicles also share the same interior space. Knee room for passengers at the rear is among the best in the segment (17 cm when the seat is pushed back to the maximum).
By offering a hatchback and coupé, Citroën is pursuing the strategy initiated in the supermini segment, where it has three complementary offers (C2, C3, and C3 Pluriel), each with distinctive styling to address wide-ranging customer tastes.

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Exterior

Two vehicles of distinctive styling

C4 styling:folowing lines and stong aerodynamics

The C4 Hatchback and the C4 Coupé have very different styling, while also sharing a number of features that identify them as members of the same family.

The style of the C4 is characterised by decisive architectural choices. Its height is limited in order to optimise aerodynamics, road behaviour and fuel consumption. In consequence, power and fluid design lines emerge as the key traits qualifying the C4.

However, the real signature of the C4 can be read in its strong exterior features, some of which are common to both the hatchback and the coupé.

These distinctive signs can be seen on the front end in particular, with the chrome chevrons spanning the full width of the radiator grille, and the boomerang-shaped lights extending up to the vehicle wings.

Other distinctive and stylish features include the flag-shaped rearview mirrors on the front doors, which give prominence to the sides of the C4.

Looking beyond these shared attributes, Citroën is offering two clearly differentiated body styles:
a hatchback of fluid, dynamic lines with strong curves

• a coupé of longer, sharper lines with a spectacular plunging tail.

In both cases: smoothly flowing contours with an ever-present emphasis on aerodynamics.

A hatchback of assertive design

The C4 Hatchback boasts smooth, protective bodywork, with unique exterior styling.

The profile of the hatchback is traced in a single line, with a strongly raked windscreen that extends the taut lines of the bonnet, before moving smoothly on to the curve of the roof.

Similarly, the high, arched waist line reinforces the feeling of safety and protection enjoyed by the passengers. At the same time, the elongated windows draw out the cabin and accentuate the fluid lines of the hatchback.

The body style of the C4 Hatchback shows distinctive lines of force, which underline its dynamic character. In addition to the headlamps placed either side of the double chevron on the radiator grille, other particularly striking styling features include:

• the rear lights, whose geometric shape expresses dynamic power. The lower part underlines the vehicle’s stability, while the upper part runs along the rear window up to the lip at the top of the tailgate,
• the quarter windows and waist line suggesting controlled power.

A coupe with a difference

The exterior styling of the C4 Coupé owes its force to the dynamic fluidity of its proportions, which combine a long wheelbase and long front overhang with a short rear overhang.

The profile of the coupé expresses the pursuit of optimal aerodynamic design. The receding lines converging towards the rear of the vehicle suggest movement and fluidity. The waist line – slightly curved towards the rear – and the prominent wings, suggest stability and good roadholding.

The C4 Coupé possesses a distinctive style, with a flowing, easily recognisable profile, and a reverse-sloping rear window with a spacious passenger compartment. Its styling is a mix of sportiness and interior space.

Architecture combining aerodynamic design and generous volume

The C4 was designed to meet stringent aerodynamic targets, while also offering class-leading space at front and rear.

Best Cd in its category

Extensive aerodynamic studies were conducted on the C4 in order to obtain a drag coefficient (Cd) of up to 0.28 for the coupé, a record in this segment. The hatchback boasts a Cd of up to 0.29. These values promise acoustic comfort, along with reduced fuel consumption and lower pollutant emissions.

They are achieved by:
the exceptionally fluid body styles, with:

• limited height (1.46 m),
• a windscreen placed well to the front, continuing the line of the bonnet,
• a long roof with a dramatic drop at the rear,
• sides narrowing at the rear.

The presence of exterior features designed to smooth the air flow:

• flag-shaped exterior rearview mirrors,
• aerodynamic undertrays to smooth out the airflow under the body,
• a rear spoiler extending the flow-line of the roof to the maximum extent,
• bumpers designed to improve the airflow over the wheels,
• front windscreen wipers integrated in the scuttle aperture to avoid disrupting the air flow.