The water pump may fail resulting in engine overheating and possible timing belt damage. Overheating and/or timing belt failure can result in very expensive engine repairs. As a precaution, it is recommended to inspect the timing belt and water pump at regular intervals.
Car Problem Reports
Audi A4 Quattro Inspection of Water Pump and Timing Belt
Audi A4 Quattro Problem
Engine Affected: 1.8L 4 Cylinder Turbo