Of course, the knowledge of the error and its deletion is not a fix !! But if errors only in a blue moon occurs once (due to contact failure of connector, short wiper because the el. Times "swallowed" have etc) the part of gold is worth, because what many workshop with often dubious success so like everything changed times when the Motor fault lamp comes that you can read in relevant forums ...
For me, the part has already paid off, because even for the error-erase require some repair shops have more than 38 Euro, and who knows what is the change a stop there ...