No, it won't need attention if all it said was that the sensor was blocked. If you get that in a snowstorm, it's undoubtedly because snow has accumulated on the outside corners of the the rear bumper. The radar can't penetrate snow, so it's like putting a blindfold on the sensors. You said it happened when it was clear, too. But there could have still been snow on the bumper. Or even a sufficiently thick accumulation of road dirt and salt could block the sensor.
And, FYI, the owner's manual shows the location of the sensors (page 119 in my book), so you know they're not in the mirrors. And it also explains the meaning of the "sensors blocked" message you saw (page 126 in mine).
There is a message labeled "System fault" (also explained in the owners manual...surprise, surprise) which would mean that the car would need attention, as boomer suggests. But if that's not what you saw, that's not the problem. Just clean off your bumper.
And, FYI, the owner's manual shows the location of the sensors (page 119 in my book), so you know they're not in the mirrors. And it also explains the meaning of the "sensors blocked" message you saw (page 126 in mine).
There is a message labeled "System fault" (also explained in the owners manual...surprise, surprise) which would mean that the car would need attention, as boomer suggests. But if that's not what you saw, that's not the problem. Just clean off your bumper.
