One problem related to oil pump 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.
The oil pump quit, causing the oil pressure lamp to come on. The vehicle is still under warranty, but since I cannot produce all of the receipts for oil changes since I purchased the vehicle, they will not cover the warranty. The dealer says that the failure was due to oil sludge. I was not informed that I had to keep receipts for oil changes durring the lifetime of the vehicle.