Mitsubishi MOTORS Outlander 2019 Owner's Manual page 212

Blind Spot Warning (BSW) (with Lane Change Assist) (if so equipped)
When there are foreign objects on
the sensor
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5
When the warning display appears, the radar
sensor cannot detect a vehicle traveling side
by side or an approaching vehicle, because
foreign objects, such as dirt, snow or ice,
adhere to the bumper surface around the sen-
sor.
Remove a dirt, freezing or foreign material on
the bumper surface around the sensor.
When the warning display does not disappear
after having cleaned the bumper surface
around the sensor, contact an authorized Mit-
subishi Motors dealer.
5-130 Features and controls