Genuine VW Gen 5 Haldex Pump Audi, Skoda, Seat 0CQ 598 549 For Rear Differential AWD System. Failure of the rear Haldex pumps is a common fault, resulting in the loss of 4WD. Drivers usually notice this when accelerating hard and the traction control system kicks in, with the front wheels loosing grip. Borg Warner (Supplied Through S-TEC Germany). 0CQ 598 549, DS2002773, SP03152. We are happy to check for you.