My low oil light (yellow) came on yesterday while driving on the motorway. I had some oil in the boot so I topped it up a little, without even looking at the dipstick first. The manual says the light resets when the bonnet is open, but mine stayed on. I then checked the level and it is fine, possibly even a little over the maximum where I topped it up. The light is still on. COuld it be a faulty sensor (although I think it says in the manual that if flashses if it is faulty)? Or does it also indicate if something else is low? Low power steering fluid or something?