Susec

Hi, my engine warning light has come on shortly after setting off. It was reset, I drove about 2 miles, and it came back on again. The code on each occasion is 18826, which is an unknown code when searched for. Prior to this code, there is a "fuel pressure regulator disparency". Can anybody shed any light including whether the car is safe to drive or not. I rely on it to get to work - I'm a nurse in a rural area - stuck without it! Thanks in advance!