When I try to start my diesel Mercedes A180 it doesn't start and the diesel cap opens instead!
When I turn the key, sometimes it makes the starting noise (but then stops). At other times it doesn't even make the noise when I turn the key and other time didn't even light up any light on the panel. And as I said, when I turn the key, the fuel cap opens.
Does anybody know why this is happening? Could it be the battery?