disconnect your battery leads overnight, this will turn the m.f.l. off, and clear the memory of faults, this light can create worry and imageinary problems out of all propotion that dont exist. if its not broken, dont try to fix it, top it up with oil, and water, and drive it untill it stops altogether, even the garages with all their diagnostics, work on an elimination process, not always finding any fault at all but still charging you 35£ for telling you so. as for the timeing chain nissan are one of only a few that use them instead of a cam belt and when they brake they leave the valves to hit the tops of the pistons, another con! when all they need to do is loose a bit of compression and notch the piston crowns as they all used to be, belts hold up trouses, chains hold sprockets together,
if your trouble is due to a timeing chain fault, my spanners are going on ebay.
honestwelsh cjh, January 2008