A4 speedometer randomly stops
 

Hi there,

i have bought an audi a4 1.9 130 diesel, when i had the car washed a week ago the speedometer stopped working but once restarted car worked fine.

And today has done the same (been raining here in sunny skeg).

Anyone have advice or previous experience of what it could be? Im assuming its water getting in somewhere, but unsure where to look.

Thanks

Benvo