My 2002 A6 caught on fire and burned very quickly, cause unknown, fire
started somewhere in the engine. However, the most shoking thing was,
that excet my door that I already opened when I got out, beither the
other doors nor trunk were not opening by the key.

Appreciate if anybody knows anything about that or the design of the
door latches that would explain it. Trunk for one sustain very little
fire damage, so what is cause?!