Apologies for the trouble you encountered when removing the NOx sensor.
By the way, did you purchase the vehicle from an individual? That is, there is no legal guarantee to rely on?
Indeed, I am.Am I to understand that you determined the AdBlue problem to be caused by a malfunctioning NOx sensor? Is an MB scanner in your possession? Also, did you know that updating the software would be necessary while replacing the NOx sensor?
Some private dealers have been unscrupulous, which is why I am asking.recognised for their attempt to cover up costly AdBlue flaws for a short time before selling the vehicle to an unwary buyer. You should definitely get the problem checked out before you shell out any cash, even if there's no turning back once it's a private sale.