Code 43 or 45 on a 98 GS teg

I just did that trick with the paper clip in that little blue houseing thing. It blink 4 times slow then 4 times fast. I have no idea... i did it four times and the same results.

43 Fuel supply system
45 Fuel system too rich or lean

What does that mean and what do i have to do to fix this problem, im figureing they are kind of the same thing since it has to do with the fuel. Thanx in advanced

if it blinked four times slow, then, four times fast...................that would make it a code 44.

????