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.Google+
Car Problem Reports
Volkswagen Jetta TDI Premature Head Light Bulb Burnout and Bulb Harness Failure is Common
Volkswagen Jetta TDI Problem
Average Mileage: 70,000 mi (55,000 mi - 90,000 mi)
Visitor, 2012 Volkswagen Jetta TDI, 55,000 mi
Over the 16 months I have owned the vehicle (purchased new from VW dealer), the front headlamp bulbs have required replacement 4-5 times. On the second and third failures, the entire headlamp assembly was replaced by VW just before the 36K warranty expired. This did not fix the problem, as I continue experience bulb failures about every 10K miles. Unlike many post on forums, which discuss hot wires or loose connections, my issues have been solely bulbs that burn out. I have substitued various types of H7 to see if it is a bulb reliability problem, but the frequency of bulb failure has not changed.
hAVE CHANGED 4 TIMES ALREADY
Visitor, 2012 Volkswagen Jetta TDI, 85,000 mi
Replace the headlight about three times on each side.
Visitor, 2009 Volkswagen Jetta TDI, 65,000 mi
Appr every 16000 miles one of the headlight bulbs have had to be replaced. The dealership has found no fault in the harness...only the bulbs, and changing the blown one or both does not affect the longevity of the bulbs...one will blow appr every 16000 miles.