New member with fuse problem with A140 Classic

Hello,
I am new to this forum, and in fact any forum
I'm a bit unsure of where to post a question about a problem I have. So I'll write it here and perhaps anyone can steer me in the right place.

I have a Mercedes Benz A140 Classic (2003) Petrol, Tiptronic. Fuse 48 had blown, I replaced it and it blew again. I don't know what this might relate to. Searches online took me to http://www.aclassinfo.co.uk/mypage.15.htm which told me this fuse relates to the Pre glow control module (Diesel) or air injection.

Has anyone had this problem before, or does anyone know what might be causing the fuse to blow?

Thanks very much in advance.

DM

EDIT - I've just realised I have actually posted a question in the wrong section. So I'm putting this question in the technical issues section. Thanks.