Golf 4 Golf Windshield Motor

Hello, good morning, I have a golf IV and the engine of the windshield wiper, it has begun to lose strength and in the end it stands, some friends gave me that at 90% it would be the engine but that the bars could also be oxidized and that for those you get to stop, I would like to know that they think Utds. thank you.

It has more face to be an engine if it were for oxide, nothing would move, although you may have current arrival problem.

Well, in the end it has been oxid, and I have not been able to take it off, I bought other rods from the € 30 € and in the end it already works, thanks for the answer anyway