My 1993, 300D front drivers door refuses to lock, with the key or from the inside button. All the other doors lock and unlock with the key, the windows go up and down when required by the key but the door refuses to lock.
What could be the problem?
Thanks

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Den
1993 MB 300D 2.5
2001 VW Jetta TDI 5 spd.
2001 new bug TDI 5 spd.
Motorcycles