Volkswagen Golf GTI 2016, Owner'S Manual

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Fig. 155 Area around the radar sensor to be kept clean and free of
obstructions.
Please first read and note the introductory information and
heed the WARNINGS →
Introduction
Vehicles equipped with ACC have a radar sensor below the front
bumper to monitor the traffic situation → Fig. 154 ① . The sensor
can detect moving vehicles up to about 390 ft (120 m) in front of
your vehicle.
The radar sensor function can be impaired by things such as mud,
slush, or snow, or by conditions such as heavy rain or spray. In
cases like these, the ACC may not work. The driver message ACC
not available appears in the instrument cluster display. Clean the
radar sensor as required → .
The ACC and Front Assist systems will automatically be available