Limp Speed Driver Error
This bulletin applies to 2008 Audi Cabriolet A4, S4 and RS4 models. The engine may return to idle speed of approximately 1,400 rpm even with the accelerator depressed. In addition, the engine hesitates and lacks take-off power.
This condition may be caused by driver error, when the brake pedal and accelerator pedal are depressed simultaneously.
With the introduction of “fly-by-wire” Electronic Power Control (EPC) to fuel injection systems, an engine rpm control feature has been incorporated into the engine electronic control system software. Application of both brake and accelerator pedals at the same time after about two seconds results in engine speed to return to 1,400 rpm idle speed.
Yes, some people do drive around with their left foot resting on the brake pedal.