Engine light on and another light with engine and arrow pointing down is on on 2005 Isuzu Ascender

The engine light is on. now a light shape like the engine with an arrow pointing down is on. When this light comes on the cars begins to drive very slowly

Asked by for the 2005 Isuzu Ascender
I am not positive what it is, but I have had the same problem with the smaller engine light. I noticed that after I put oil in it, the light turned off. Im guessing it might be a low oil light. My big engine light came on one day when I was at a red light and my truck stalled. Probably due to needing oil. So try to add oil and see if this helps.