Instruction book AUDI A4
 Audi A4   Controls  Parking aids
In towing mode, the rear parking sensors are NOT activated when you select reverse gear or press the switch. This may not apply if the power socket was NOT factory-fitted. This results in the following restrictions:
Rear parking aid*
There is no distance warning.
Parking system plus*
There is no rear distance warning. However, the system will still give a warning when obstacles are detected while driving forwards. The proximity graphic will switch over to towing mode.
Parking system plus with reversing camera*
There is no rear distance warning. However, the system will still give a warning when obstacles are detected while driving forwards. The proximity graphic will switch over to towing mode. The image of the reversing camera will then be shown without orientation lines and blue area markings.

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