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My name is XXXXX XXXXX I am a professional here at Just Answer. I noticed that your question was not getting a response and thought I would ask to see if you still need help with this.I would have a shop or the dealer that looked into this check into any faults with any of the wheel bearings as well as the front axles and 4wd mechanical components.In some cases if it is a gear box on the vehicle the oil may have metal in it and if there is metal usually this is an indication the fault may be internal in the gear box that has the metal and would need removed and disassembled to inspect for the fault and repaired or replaced.It is difficult to say for sure from here exactly what is causing this for sure but I would have these checked into first.If the dealer cannot reproduce the fault right away they may have to hold onto the vehicle for a day or more to duplicate the fault so then it can be repaired.I have had to do this in some cases just so I could catch the fault to locate it.I hope this has helped in some way here.If you need anything else don't hesitate to ask thats what I am here for.Thanks Pete
2003 Jetta left rear window blue plastic part of the