One problem related to diesel engine has been reported for the 2004 Volkswagen Beetle. The most recently reported issues are listed below.
The contact owns a 2004 Volkswagen Beetle. The contact stated while driving the vehicle it would shift into neutral gear and then the brake pedal had to be engaged in order to shift back into drive. The contact spoke with the dealer who was told that the control valves caused the failure. The current mileage was 64,000. The consumer stated the engine would increase in speed and the transmission shifted down to 5th gear. Updated 12/02/11.