Ford Expedition 2020 Owner's Manual page 263

Note: If your vehicle has a radar sensor, we
recommend that you switch the system off
if you install a snowplow or similar object
in such a way that it could block the radar
sensor. Your vehicle remembers the selected
setting across key cycles.
Blocked Sensors
E305503
Camera Troubleshooting
The windshield in front of the camera is
dirty or obstructed in some way.
The windshield in front of the camera is
clean but the message remains in the
display screen.
Expedition (TB8) Canada/United States of America, enUSA, Edition date: 201907, Third-Printing-
Driving Aids
Cause
If a message regarding a blocked sensor
or camera appears in the information
display, the radar signals or camera images
are obstructed. If your vehicle has a radar
sensor, it is located behind a fascia cover
near the driver side of the lower grille. With
an obstructed radar, the Pre-Collision
Assist system does not function and
cannot detect a vehicle ahead. With a
blocked sensor or camera, the
Pre-Collision Assist system may not
function, or performance may reduce. The
following table lists possible causes and
actions for when this message displays.
Clean the outside of the windshield in front
of the camera.
Wait a short time. It may take several
minutes for the camera to detect that there
is no obstruction.
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Action