One problem related to engine knocking noise has been reported for the 2003 Volkswagen Passat. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Volkswagen Passat based on all problems reported for the 2003 Passat.
I have owned 3 vws and have always made sure to stay up to date on scheduled maintenance. Recent knocking noise in engine lead us to take the car in for a repair at which time we were informed that we had a major sludge problem and it would cost me $6900 to replace the engine.