My son has a 2011 A6 2.0 TDI Saloon (this is probably C6 platform as it was first registered in Jan 2011).

One of the rear parking sensors is faulty, I've identified it as is doesn't tick when in reverse. I would like to try and replace it without having to remove the bumper as I really do not want this hassle as I'm getting too old for this. It is the inside right sensor and by loosening the underside rear panel I can get my arm up inside and physically get hold of the sensor.

Can anyone who has replaced one of these describe to me just what the procedure is to replace this sensor (such as how does the plug connector come off and how is the sensor actually fixed to the bumper) as I would be working blind and with only one hand. If it is possible to do it this way I could save my son quite a bit of expense as the Audi dealer has quoted £300-£400 to do the job.