Replace a Fuse: 2002-2009 Citroen C3 - 2004 Citroen C3 SX Click to view0:17Replace a Fuse: 2002-2009 Citroen C3. The more electronics your C3 has, the more fuses it has. Some Citroens have multiple fuse boxes in the engine bay, so be sure to find the fuse (s) in question. Some components may have multiple fuses, so make sure you check all of the fuses that are linked to the Citroen C3 C3 Fuse Box Locations the maxi fuses in the maxi fuse box on a Citroen C3. The maxi fuse box is attached to the underside of the engine bay fuse box by the big nut and thread which also attaches the black lead. There are also two rather inaccessible clips located under the fuse box holding the maxi-fuse box to the engine bay fuse box.