The yellow side lights come on but thats it dont know where the ecu fuse is either .

engine light says I am low on do i refill it

then you could have the boot open and not open any doors, last resort not would open not even with the key.

Audi told us we need to new door locks and diagnostic costing 804.00.

Will it resolve the problem they are not sure.

a6 30 thousand on the clock 5 years old not used very often????