The various sensors can get blocked by snow, extreme rain, dirt, etc. The car will let you know when everything from a parking sensor, to adaptive cruise, to collision avoidance isn't available. First time it happened, I freaked out...then I figured out what was going on and was thankful.
I have taken it through the automatic brushless touchless carwash several times never had an issue with any of the sensors until this time when I used a garden hose and blasted the grill directly to get the salt out. Maybe that was too much for it.
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