2017 Ford Explorer BSM issue

only passenger side blind spot working why

I don’t know, but that sounds like something I would have the dealership take a look at

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The Blind Spot Monitoring (BSM) system uses two radar-based sensors, located inside the rear bumper fascia , to detect highway licensable vehicles (automobiles, trucks, motorcycles, etc.) that enter the blind spot zones from the rear/front/side of the vehicle.

Tester

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The simple answer is…………something is broken.
You’re welcome.

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Has the vehicle suffered any fender benders?

this is for a ford fusion but it will give you the idea what to look for…
FORD BLIND SPOT SYSTEM MALFUNCTION REPAIR - YouTube

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