I would scan the car for trouble codes with a vw compatible scanner but it is most likely, the door lock module is bad. You can replace it or repair it; there are genuine vw and aftermarket Dorman versions.
Read more about what causes the problem and how to repair the part:
VWVortex.com - MKIV door locks explained - why you're having problems!!!
Dorman Part #: 931-500
Integrated Latch Actuator
Application Summary: Volkswagen 2014-99
Application Notes:
Front Left
http://www.dormanproducts.com/gsear...&parttype=Door Lock Actuator Motor&origin=YMM
Seeing how a genuine vw part; is $25 more from amazon and the Dorman has some bad reviews; I think I would go with the genuine vw part if you decide to replace it:
Volkswagen part #: 3B1837015AS
http://parts.vw.com/parts/2001/Volkswagen/Beetle/GL?siteid=9&vehicleid=206923&diagram=9210405
https://www.google.com/search?q=931...rome..69i57&sourceid=chrome&es_sm=91&ie=UTF-8
There are cheap aftermarket versions; for less than $40 but I have no idea about their quality or how long they would last.
http://www.ebay.com/sch/i.html?_fro....TR2.TRC0.A0.H0.TRS0&_nkw=3B1837015A&_sacat=0
Read more about what causes the problem and how to repair the part:
VWVortex.com - MKIV door locks explained - why you're having problems!!!
Dorman Part #: 931-500
Integrated Latch Actuator
Application Summary: Volkswagen 2014-99
Application Notes:
Front Left
http://www.dormanproducts.com/gsear...&parttype=Door Lock Actuator Motor&origin=YMM
Seeing how a genuine vw part; is $25 more from amazon and the Dorman has some bad reviews; I think I would go with the genuine vw part if you decide to replace it:
Volkswagen part #: 3B1837015AS
http://parts.vw.com/parts/2001/Volkswagen/Beetle/GL?siteid=9&vehicleid=206923&diagram=9210405
https://www.google.com/search?q=931...rome..69i57&sourceid=chrome&es_sm=91&ie=UTF-8
There are cheap aftermarket versions; for less than $40 but I have no idea about their quality or how long they would last.
http://www.ebay.com/sch/i.html?_fro....TR2.TRC0.A0.H0.TRS0&_nkw=3B1837015A&_sacat=0