1.A impeller within the vacuum pump fails causing vehicle faults. 2.Sometimes water ingress can cause problems with these pumps, often however the impeller on the spindle of the motor can break or shatter over time. 3.A broken impeller will cause a of air pressure / vacuum to be provided meaning actions of the pump will be inhibited. 4.It can also lead to a jammed motor which will lead to the pump blowing the 20A fuse and shutting off. fot motor part number: 1397220291 pump part numbers: A2308000648, A2308000548, A2308000448, A220800348, A2208000648, A2208000748, A2208000548, A2208000848, A2208001148, A2208001248, A2208000948. Fitment: For SL- (R230) 2001-2011 1st gen: 2001- 2006 - SL350, SL500, SL600, SL55AMG, SL65AMG Facelift 1: 2006 - 2008 - SL350, SL500, SL550, SL600, SL55AMG, SL65AMG Facelift 2: 2008 - 2012 - SL280, SL300, SL350, SL500, SL550, SL600, SL63AMG, SL65AMG For S- (W220) 1998-2005 S280, S320CDI, S320CDI L, S350, S350 L, S400CDI, S430, S430 L, S500, S500L, S500 4-, S600L, S55 , S55 L For - (C215) 1999-2006 CL500, CL600, CL55AMG, CL63AMG, CL65AMG Material:ABS Colour:black Package Contents: 1 * Motor Impeller Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.