What would cause the door ajar indicator light to remain on when car is off and doors are closed? This is also draining the battery.

SOURCE: door ajar indicator stays on

you may just need to adjust your door jams they may not be closing properly, the other thing you can try is opening one door at a time and putting your finger on the switch usually in the lower l/h corner of b piller and see if the light goes off if not this may be the problem and replace the switch

SOURCE: 2002 Jetta red door ajar light stays on-car alarm won't activate

you have to find wich door is first becouse they all have kill swich in every door so u have to disconect one by one n by pass to see wich one turn the light off then u will have to replace it auto parts store shuold have these at hand, lol becouse as long the light stay on the alarm will not work,

SOURCE: door ajar light won't go off

I had the same problem. Spray WD-40 (with the sprayer extender) into the latch of the doors very liberally. Open and close doors a few times. Should resolve issue.

SOURCE: 330I drivers side airbag deployed and the car will not start

You triggered the impact sensor.(usually on or near the front bumper) It will need to be re-set or replaced, and obviously, you need to replace airbag.

SOURCE: instrument cluster indicates door ajar but there is not

The door latch has a switch built into it to replace the old door jamb switch. If the switch is faulty the system will think the door is ajar. A scanner will show an open switch.

YOU SHOULD BE UNDER WARRANTY.