So I have noticed that my car has been running rather rough lately. Seemed like a knocking sound and a lot of vibrations when it would start but then it would smooth out. The other day I checked the oil and sure enough I didn't even have anything showing on the dip stick. The next day I went out to start the car and it wouldn't even crank...it would start to but then shut right off. So I went and got oil and filled her up...tried starting the car and now she turns over but wont fire! What is going on? I have been reading up on these forums and notice that i may need to replace my cps as well. If I approach this where can I find a diagram or instruction on the location of the sensor? Please help I am desperate for answers. By the way my low oil display never showed up on my message center...why would that be if I was that low on oil?