One problem related to engine rattling and whining sounds 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.
After taking my 2003 vw Jetta 1. 8l turbo to the vw dealership for a broken dipstick and ignition recall, I was told there was sludge in the engine in which the car had under 68,000 miles. The dealership stated it was not under the manufactures warranty and would cost at least $900 to clean out the engine. Upon deciding to take it to a mechanic for a 2nd opinion, the car seized up and ceased to work while driving. The mechanic informed me that the entire engine was blown from the sludge build up when oil changes had been performed at 3,000 mile intervals though the manufactures owners manual stated it only had to be changed every 5,000 miles. The dealership stated there was nothing they could do about it other than for me to purchase a new engine or a rebuilt engine. After having a used engine installed from a salvage yard, I discovered from the car pouring smoke and making a high pitched whining noise. Apparently when the original engine went it also damaged the turbo as a result of sludge build up. I've further discovered after doing some research that this is a common problem to vw cars with 1. 8 liter turbo engines from models following 2000. Unfortunately because the turbo is considered an accessory to the engine, the turbo was not covered under the salvage yards engine warranty I just had installed and would require the turbo being replaced as well. The vw dealership informed me that a rebuilt turbo would cost $1700 alone not including small parts and labor after I had already spent $2800 on a used 1. 8l turbo engine and small parts and labor. The used engine had 46,000 miles on it so it is highly likely that it will also go due to engine sludge.