Increased braking effort and/or shifting to neutral would be needed to stop the vehicle, lengthening the distance needed to stop the vehicle and increasing the risk of a crash.

A malfunction of the Electronic Stability Program (ESP), while Distronic Plus is engaged, may cause the engine to not reduce power, regardless of the vehicle's speed, driving situation or brake application.

What to do: Book it in at your next service. There is no deadline and no charge.