The new ultra-low-emissions 110 diesel and the top-spec 153bhp petrol unit are both offered with PSA's love-it-or-hate-it six-speed automated manual, a transmission they confusingly describe as "clutchless". There's also a conventional four-speed auto available with the 118bhp petrol engine.
What's it like?
It's pretty conventional, really. The shape is neat and competent, with long styling lines on the sides to emphasise its length, a clever clamshell bonnet and the familiar incorporation of the Citroen chevron badge into the leading edge of the bonnet.
Despite being a bit bigger, it also manages to look more compact than the outgoing car. But in this crowded market sector there's nothing special or memorable about its looks; it's almost as if Citroen has made the C4 a 'non-halo' car to make room for the forthcoming bob-tailed DS4 high-rider, which will also be at Paris.
The interior is conventionally comfortable, with nicely chosen materials and a three-dial fascia with better standard equipment than many rivals, and lots of options. Interior room is similar to that of the previous car, which set a good standard in the class.
Notably absent is the outgoing C4's fixed steering wheel boss, which carried most of the car's key switches and was a real USP (Citroen explains the loss by claiming it has saved 3.5kg in weight). The new layout is intuitive and works well enough; the company has seen the need to spice it up a bit with gimmicks like choices of instrument light colouring and a choice of tones for the turn indicator click. This shows the direction of its concerns.
Better news on the road. Our test car was a 148bhp HDi diesel whose strong, torquey performance, allied with low noise and vibration, immediately made itself apparent.
Our test car also had a fluent six-speed manual gearbox whose long-legged top was an especially good cruising gear. Citroen says it has made exceptional efforts with seat comfort and noise suppression, and the success of this is clear as soon as you begin to drive.
Allied to these achievements is the smooth ride for which the non-sports versions of the outgoing car were also known, plus enhanced quietness over bumps. Road and mechanical noise are low, focusing some attention on the car's wind noise, which is moderate for the class.
Should I buy one?
The C4 is a modern, refined and comfortable driving machine – albeit with nothing truly special to lift it away from the many C-segment cars that also fit this description.
Choosing it first probably comes down to three things: whether you're a Citroen enthusiast, whether it's a purchase from a local dealer you trust, or whether the deal is sharper than any you can do with a rival. If you do choose a C4 you'll be getting a good, albeit undistinguished, new car.
Citroën C4 HDi 150 Exclusive
Price: £21,995 (est); Top speed: 129mph; 0-62mph: 8.6sec; Economy 56.5mpg; CO2: 127g/km; Kerb weight: 1320kg; Power: 148bhp at 3750rpm; Torque: 251lb ft at 2000-2750rpm; Gearbox: Six-speed manual
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