The new quattro system will form part of Audi’s Ultra line-up, fitted to its most efficient engines, while performance cars will still use the traditional technology. This starts with the new A4 ...

The issue affects Euro 6 compliant V6 TDI engines producing up to 268bhp, and applies to the outgoing models rather than the new A6 and A7 which are launching this year. Audi UK said it does not yet ...