I have a 2007 Solstice that I bought in 2012. I have one reoccurring issue. Every two months the check engine indicator light comes on. I take it to my mechanic, he hooks up his computer, the light goes off, I pay $ 35. I have replaced the 02 sensor so that is not the issue. Can anyone give me the procedure to possibly turn this light off? This started about three years ago. Please HELP !!!!