If you own a Saturn S-series and keep getting the code P0404 and your check engine light is on, you probably need to perform an EGR cleaning. This is actually a commong problem with soem cars and can be taken care of easily wthout having to go to the mechanic. This video will show you how to clean it properly and use the right materials for the job. You might want to wear gloves and protective eyewear when cleaning an EGR. So good luck, pay attention, and enjoy!