Oil and carbon tend to build up, creating restrictions in the intake manifold. Symptoms will be loss of power (sometimes severe) and poor fuel economy.
Problems for specific Volkswagen Jetta TDI years:
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Most reported 2012 Volkswagen Jetta TDI problems
One or both head lights may not work due to premature head light bulb burnout and/or bulb harness failure. Care should be taken to inspect the head light harness connector for damage when replacing bulbs. Damaged connectors should be replaced.
drains battery because electric fan does not shut off. Dealer replaced fan free of charge due to recently out of warranty.