Changes to the exterior focus on restyling the vehicle’s front end, bringing the C4 in line with the prestigious looks of the recently launched C5. Its new bonnet features a more rounded, curvier design, whilst the grille benefits from restyled integrated chevrons. The front bumper has also been revamped and the number plate repositioned for a stronger, sportier, more dynamic look.

The C4 is now available with two new petrol engines which have been co-developed with the BMW group – the 1.6 16v VTi 120hp and the 1.6 16v THP 150hp. Both units offer the optimum blend of performance, driving pleasure and fuel economy, with significantly lower consumption and CO₂ emissions.

C4 1.6 16V VTi 120hp  (Variable valve lift and Timing Injection)

The VTi 120hp petrol engine, with a manual or automatic gearbox, replaces the 1.6i 16V 110hp unit, offering an economical and responsive driving experience, with fuel efficiency of 42.2mpg and CO₂ emissions of 159g/km on the combined cycle (down 6% on the former unit).

The VTi unit is fitted with an aluminium block and cylinder head and features continuously variable valve timing. The intake valves also benefit from a system that allows their maximum travel to be adjusted gradually depending on the force applied to the accelerator pedal. These two features boost engine efficiency and increase responsiveness with some 90% of maximum torque available all the way through the rev range from under 2,000 through to 6,000rpm.

C4 1.6i 16V THP 150hp (Turbo High Pressure)

The new THP 150hp (Turbo High Pressure) engine provides the perfect blend of higher performance, driving pleasure and economy with significantly lower fuel consumption and CO₂ emissions. With its six-speed manual gearbox, the THP 150hp’s fuel consumption is 40.9mpg on the combined cycle with CO₂ emissions of 164g/km.

The THP 150hp features engine technology that is new to the C4 range with the introduction of direct sequential injection and a twin-scroll turbocharger as well as continuously variable inlet valve timing. This gives the engine excellent low-down pulling power with maximum torque of 177lb.ft almost all the way from just 1,400 through to 3,500rpm and continues strongly through the rev range.

Citroën’s HDi diesel engine line-up is widely recognised for its frugal, clean and dynamic qualities, and in keeping with the model’s upgrade, the C4’s diesel engine range has also been improved.

The 2.0HDi unit with six-speed manual gearbox and particulate filter fitted as standard, boasts fuel efficiency of 53.3mpg on the combined cycle and CO₂ emissions of just 140g/km. The other diesel powered models – the 1.6HDi 92hp and 1.6HDi 16V 110hp DPFS EGS – are just as dynamic as before and now even greener thanks to a switch to low rolling resistance Michelin Energy Saver® tyres, available on 16-inch wheels, which reduce the fuel consumption and lower the  CO₂ emissions.

The original C4 was one of the most environmentally friendly cars in the small family segment with two models returning emissions of 120g/km. Now, with its reduced emissions, the C4 is even cleaner and even greener.