W215 CL500 Parking sensors not working

[jason1883]

Hi everyone.
A few months ago I went out and bought my dream car, A W215 CL500.
I knew there was an issue with the parking sensors but bought the car anyway. The issue is when the car is started the display above the rear windscreen goes straight to 2 red bars, constant beep for a few seconds and then its like the system switches off while the front display doesn't come ON at all. The front display is constantly dead no lights nothing. The button on the dash doesn't do anything either.
Are there any fuses or relays that need to be checked?
What should I do?
Any help or insight would be greatly appreciated.
Regards
Jason

 

[m2287]

One of your sensors is dead, get it read on star and it will tell you which one.

 

[zoros]

Also check first to see if any sensor is blocked. This happens with time if owners wax over them and don't clean them scrupulously !