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High enough mileage (you didn't say) and a lack of having the timing belt changed at recommended intervals in the owners manual. You really should do this, it isn't just a optional suggestion, they really mean they need to be changed. I always tell people "it is easier and cheaper to drive the vehicle in to have the timing belt changed at your scheduled convenience than it is to be stranded and towed in to have it replaced at your extreme inconvenience". Some makes (Nissan in particular) have interference engines where a broken belt often results in valves being open when the still turning crank drives pistons into them, bending or breaking them. If the timing has jumped it could very well backfire as would a valve hanging open.
You're in the TDI (diesel) solutions section so it uses glow plugs. If it's a petrol engine 2.0L then it would be accessible above and below intake manifold using a swivel spark plug deep socket.
My sincere apologies for the delayed response. I am personally going back to answer your unanswered questions.
I do not know if you still need this information, however I am answering it either way.
The Serpentine Belt: visible on the outside of the Engine, should be replaced every 60,000 miles. The Timing Belt: not visible/inside the Engine, should be inspected/replaced every 100,000 miles.
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full service means different thing to different mechanics ,like to a fleet fitter it means a good strip and inspect ,to a dealer fitter it means a nice bonus job where the pen is mightier than the doing the actual work .
A mechanic told me there really isn't a "tune up" per say for a Jetta TDI. Most importantly, the timing belt (w/water pump) replacement is the biggest concern. Change all the belts, check the glow plugs. If you drive on the highway a lot, the mass air flow sensor and its related hoses should be ok (carbon build up).
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