Audi A4 2.0 TDI is the same engine that features in the A4 Saloon and Avant models
However, the reduced weight of the cabriolet, combined with Audi's pump-injector fuel injection system mean that it is even more economical to run.
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With fuel consumption figures of up to 43.4 miles per gallon it offers drivers cheap running costs, while the turbocharger means that 60mph can still be reached in a respectable 9.7 seconds.
The 2.0 TDI will be joined by four other petrol options from the turbocharged 1.8-litre to the top of the range 3.2 V6 FSI.
All five new Audi A4 Cabriolet engine variants will be available with a choice of three equipment options.
The standard, sport and S lines all offer different levels of trim and gizmos while five and six speed manual gearbox options, as well the choice between front wheel or four wheel drive, mean that customers can tailor a new A4 to their own driving style.