P0172 and P0175 Help Please Guy's

[robroy55]

Hi Folks,
I have a 2002 Duratec with 39K. The check engine light just came on today. The code P0172 says (Systim Too Rich Bank 1 ) P0175 says (System too rich bank 2 ). The ONLY thing I have done is to put 5 Gal of gas in the car with Sta-Bil mixed in that I had for my home generator. Would this cause these the engine to run rich and cause the codes?? I only put the proper amount of Sta-Bal called for for the 5 gals of gas I put in the car.
Thank you all for all your help with my questions!!!!
Rob Roy