BLIS False Alerts

Due to the nature of radar technology, there may be certain instances when the BLIS will alert with no object present in the blind zone. This is known as a false alert. Some level of false alerts are normal.
Circumstances that may cause a false alert are; guardrails, freeway concrete walls, cyclone fencing, sharp turns around a pole or building, or coming to a stop with a vehicle directly behind but very close. False alerts are temporary and self correct.
See also:
Safety and environment protection
Warning symbols in this guide
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this guide, answers to such questions are contained in comments
highlighted by the warning ...
Determining if the Personal Safety System is operational
The Personal Safety System uses a warning light in the instrument
cluster or a back-up tone to indicate the condition of the system. Refer
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Ford Esp Extended Service Plans (Canada only)
You can get more protection for your vehicle by purchasing a Ford
Extended Service Plan (ESP). Ford ESP is the only service contract
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