It's been a while since I posted a thread. I had this problem with my engine running rich all the time and it cuz the light to come on. I ask everyone here for their input. Sadly, none of the suggestions were correct. Turns out, the problem is the K&N FIPK II. Yep. Once the stock air tube was reinstall, and a stock air filter put in, everything went back to normal. Learned my lesson the hard way. So, anyone wanna buy a used FIPK II? I'll sell it to you really cheap. Hopefully you'll have better luck then me.