APDTY 531282 Timing Belt Hydraulic Tensioner Adjuster Fits 1998-2001 Audi A6 1998-2004 A6 Quatro 1999-2001 A4 2000-2002 S4 2001-2005 All Road Quatro 98-2005 Volkswagen Passat (Replaces OE 078109479E) A essential part to have a precisely timed and operationing engine Recommended for replacement when replacing the timing belt