I had the fuel system cleaned out last week (the $160 service) at the chevy dealership last week thursday and just about an hour ago the car set off the check engine light. It is showing the code P0172. Went to autozone to find out this is due to a rich or lean fuel trim condition. Could this be from the fuel system cleaning? The car hasnt had the check engine light come on at all since I bought it new and now all of a suddent it goes on.