In Spain official audi dealers are instructed to carry out the "23C4 campaign" to any 2.0 140cv or 170cv engines (Seat and VW also) during regular servicing.
Basically this modifies the engine mapping system in order to reduce contamination and emissions. Results is that engines do not have all their torque between 1800-2200 rpm. Cars become lazy and a lot of users have reported sluggish and slow performance... including myself.
Does anyone know anything related to this?