Lincoln 2016 MKX Owner's Manual page 241

Driving Aids
Note: For manual transmission vehicles, the
cross traffic alert will be active only if the
transmission is in reverse (R). If your vehicle
is rolling backward and the transmission is
not in reverse (R) then cross traffic alert will
not be active.
E142440
In this first example, the left sensor is only
partially obstructed; zone coverage is nearly
maximized.
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MKX (CD9) Canada/United States of America, enUSA, ASO/OGC Review