See also:

Damage
Periodically inspect the tire treads and sidewalls for damage (such as bulges in the tread or sidewalls, cracks in the tread groove and separation in the tread or sidewall). If damage is observed ...

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). ...

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