I have a 2007 chevy cobalt, 5 speed, 2.2L. I need some help with the secondary air injection system. My check engine light is on and I think the code for it is P2430. I cannot figure out how to fix it, I changed all the filters and the sensor the goes in the air filter hose and it still keeps coming on, any help with this would be great. I get between 31 to 34 MPG and it has 153,000 miles on it and travels 84 miles a day, its a very good car.