ok so i just got my fan workin good and i let the car idle for a few minutes and all of a sudden im gettin some smoke comin from around my driver side valve cover and i look in my haynes and it said its the air check valve? and now im gettin the service engine soon light and i was wondering if this could be the problem and if it is cheap to replace? ANY HELP!!!!!!! PLEASE

 

Those check valves should be at Autozone/Advance - and they were cheap.

 

ok thanks