It's the BLACK KEYHOLE shaped cap. It may have a black or red locking tab that you will have to break off to remove. The red round one is for your engine oil.
Do you have a Mercedes transmission fluid measuring tool?
Hi, I own a GLA -250, the problem I am having is the sensors start to beep for no reason with no vehicles near my car, it happens more in hot weather.
If anyone has had this problem and we’re able to resolve it I would really appreciate your feedback on this issue.
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