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: 55,000 mi (55,000 mi - 55,000 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.