One problem related to engine clicking and tapping noises has been reported for the 2004 Volkswagen Jetta. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Volkswagen Jetta based on all problems reported for the 2004 Jetta.
Car began making loud popping noise. Took car to dealership. After three days of evaluation, the dealer had to contact vw technician for assistance. The vw technician informed the dealer to check the camshaft as they have been noticing problems in the field in vehicles with 80,000 - 150,000 miles. They stated that there was a problem with the metal being too thin and wearing too quickly.