I do all of my own service. Here are the known issues with the 06 Jetta TDIs:
1.) Cam will wear out even using VW TXT505.01 compliant oil. Do it yourself for $600 or pay dealer $2700. Ours lasted longer than most at 169k.
2.) AC will become intermittent. Do not pay for new AC compressor. Buy new RCV (unloader solenoid valve) it begins to stick over time and time and any AC shop can do it with recharge in 2 hours. Part is $70.
3.)All have a defective wiring harness for air bag under passenger seat - $220 dealer fix
4.) 5 speed manual have a dual mass flywheen that will distort due to the rubber mount between. Vibration and chatter will be symptom. It is a pain to replace by expect it by 180k miles
5.) If you buy one out of a hot area the headliner will recess on the pillars and the dash control buttons if of the black style will be sticky and nasty.
We have had 3() 06' Jetta TDI's as my wife does home health and puts on a lot of miles. First one new then 2 used ones. We have a spare purchased with only 58k miles and ready for when this one dies or gets wrecked.
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