Problems with PARKTRONIC

Problem	Possible causes/consequences and Solutions
Only the red segments in the PARKTRONIC warning displays are lit. You also hear a warning tone for approximately two seconds. PARKTRONIC is deactivated after approximately 20 seconds, and the indicator lamp in the PARKTRONIC button lights up.	PARKTRONIC has malfunctioned and has switched off. – If problems persist, have PARKTRONIC checked at a qualified specialist workshop.
Only the red segments in the PARKTRONIC warning displays are lit. PARKTRONIC is deactivated after approximately 20 seconds.	The PARKTRONIC sensors are dirty or there is interference. – Clean the PARKTRONIC sensors. – Switch the ignition back on.
	The problem may be caused by an external source of radio or ultrasound waves. – See if PARKTRONIC functions in a different location.