One problem related to engine belts and pulleys has been reported for the 2003 Volkswagen Jetta. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Volkswagen Jetta based on all problems reported for the 2003 Jetta.
Rattling noise in the engine, oil pump was not pumping oil and camshaft chain tensioner (timing belt) rattling from lack of oil. I was informed I needed to replace engine due to metal particles and carbon in the oil pan.