Benjamin Braun, who joined Audi UK as head of marketing at the end of 2016, is leading the review.
Audi wants an agency to help it push the "Vorsprung durch Technik" philosophy on apps, mobile, in-car interfaces and online.
The review affects Audi’s web agency, Salmon. The winning agency will work alongside Bartle Bogle Hegarty London and PHD.
BBH created a spot called "React" that launched earlier this month.
Braun said: "It is essential that the partner can work with Audi to accelerate the speed to market and enhance the brand’s agility in the digital space."