I Have a 2006 cobalt ls, i need a pic. of the secondary injection pump and check valve, i can't find it anywhere online, PLEASE HELP, my check engine light is on and a p2431 code came up this problem, and the dealer of course wants more money then they should get. thanks

 

I don't have a picture and don't know off hand where the air pump is but I can tell you where the check valve is...when you are standing looking at the motor, it is on the back, left hand side. It has a black top, that almost resembles the top of the oil filter housing. I have already had to change this on my 2008, that's how I know where its at.