See also:

Panoramic roof deflector (if equipped)
Vacuum the wind deflector cloth to remove insects & loose dirt. Clean with Motorcraft Professional Strength Carpet & Upholstery Cleaner (ZC-54). ...

Trailer tow false alerts
When towing a trailer, the sensors may detect the trailer thus causing a false alert. It may be desirable to turn the BLIS off if the false alerts become annoying. ...

Blocked sensor
An extreme build-up of materials on the quarter panel fascias such as mud or snow can cause degraded performance of the BLIS . Also, heavy rain can cause the same effect. The BLIS can detect ...