weird situation

Whenever the low wash or low fuel light comes on the check engine light will also come on.When those 2 lights are out for about 2 or 3 days the check engine light will go off but as soon as the either light comes back the check engine will come back too.Any ideas as to why?I once had the garage check the codes when it first came on and it was the oxy heater circuit,but it went out and now only comes back with the above situation.

I'm guessing the low fluid/low fuel are not related to the SES light.

I'm guessing the low fluid/low fuel are not related to the SES light.
It would make sense for it not to be but everytime one of these lights come on so does the SES light.The SES light will go out after a couple of days providing the other 2 lights arent on.Guess pulling the codes might be the next step to see what it thinks is wrong.