Looking at buying a 2012 ford focus dct titanium. Will be my second focus first one is manual. Owner said it had transmission issues and one time lost reverse and had to unplug the battery for a while to get it driving again. Now its been sitting and their selling it. Owned by older lady she doesnt want to risk the transmission fault coming up again and being stranded. The main issue is upon looking at the car we noticed the oil pressure light on, the car isnt knocking or anything and seems to run fine. Engine light is on but not flashing. We drove it 2 or 3 kilometers down the road and it drove fine just shifted hard from 1 - 2 but didnt have loss of power. And engine runs quiet. Oil is full. What could be going on just a faulty oil pressure sensor?