HI my a6 as a parking aid problem when I first put it in reverse it makes a 5 second tone 

sound then nothing I have been told it could be the sensors could anyone help thanks 

I'd imagine a sensor is not working.

IIRC get someone else to put the car in reverse and put your ear against each sensor. They should make a faint clicking noise if working correctly and the faulty one will not. Swap out the faulty one and you should be fine 

Hi first time on the forum  this problem has been driving me mad for months now I get the long 5 second tone when first selecting reverse then nothing I have done the following replaced all the sensors replaced the Parkhilfe control box checked continuity of the cable from the sensors to the box and it remains the same I now have new sensors new control box and when car is in reverse all sensors make a ticking noise when you place your ear close to them dont know what to do next

On 10/27/2018 at 11:07 AM, melhug said:

Hi first time on the forum  this problem has been driving me mad for months now I get the long 5 second tone when first selecting reverse then nothing I have done the following replaced all the sensors replaced the Parkhilfe control box checked continuity of the cable from the sensors to the box and it remains the same I now have new sensors new control box and when car is in reverse all sensors make a ticking noise when you place your ear close to them dont know what to do next

Hi Mel, as your a6 is a c6 and not a c5 id advise you look at getting a diagnostic check carried out.

Cheers

Steve

Hi Steve,,

Thanks for the reply I have now resolved this issue on a mates  VCDS first pass of testing it showed a fault at  the parking sensors of 01517 (J345) of the control module for the trailer/towing after a bit of head scratching as I have never had a tow bar fitted to the car I had a brainwave I realised that the Parkhilfe control box I had bought was used and that it may have been on a car that had a tow bar back on to the VCDS into control modules park assist there it was on the code a 1 in the control code to say trailer changed 1 to a 0 saved code fired the car up parking sensors working perfectly so to recap my original Parkhilfe control box was faulty as that had shown an error on the 2 middle parking sensors even after I had changed all of them thus resulting in that 5 second beep then nothing and when I changed the Parkhilfe control box it was giving the 5 second beep then nothing due to the fact it was expecting to see a trailer/towing control module hope that makes sense.

Regards,

Mel.

i have a similar problem - where is the parking sensor control unit located? (audi a6 avant 2008)