When I put the car in reverse I get a loud continuous noise instead of the intermittent beep from the reversing sensors. Does anyone know what could be the problem? Do I need to be worried

It usually means that one or more of the sensors has failed. If the car is less than 3 years old get it repaired under warranty. If not, the sensors are horrendously expensive. A code reader should tell you which one(s) has failed.

Edited 24 October, 20169 yr by Paulius55

Has it been raining and are they clean. The MK2 used to take exception to water and dirt around them.

Edited 24 October, 20169 yr by the rooster

When I put the car in reverse I get a loud continuous noise instead of the intermittent beep from the reversing sensors. Does anyone know what could be the problem? Do I need to be worried

No worries, but depends how close you were to the nearest obstruction.

I suspect a wall.

Really close.