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Problems with adaptive cruise control (ACC)

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Hi all. I bought a car with this problem, ADAPTIVE CRUISE CONTROL (ACC) was falling off. That is, after the start of the trip after a certain number of kilometres, it showed the message ‘Proximity Warning Assistant is unavailable. Sensor blocked.’
So. I thought it just needed calibrating. Anyway. I switched on Forskan and gave a command to calibrate. And..... calibration does not pass and there is a message ‘Front sensor is not adjusted.’
Could you please tell me how to adjust it or if there are any pitfalls?
Thank you very much in advance for your help.