I have a strange fault with my A6 powered by the 2.5V6 tdi.
The issue I am experiencing, is that the starter motor will not always spin.
When the key is turned, the "clack" from the solenoid can be clearly heard, however the starter motor will not spin.
If the key is left in the start position, the starter motor may start to spin after sometime. I only did it a few times and the wait was about 30seconds.
Turning the ignition on and off half a dozen time usually trigger the starter motor to spin.
I have changed the key barrel, battery and starter motor within the last two years.
When, the starter motor was changed it solved the problem temporally.
I am a bit confused on what and where is the fault
Any pointer would be most welcomed.