One of the most common error codes thrown by your car's computer is the one telling you that you have a clogged EGR system. The Check Engine Light that kept you from getting an inspection sticker needs some attention. This may mean a new valve, or you might just need a cleaning. If money is no object, go ahead and replace the valve, and get the system's plumbing nice and clean while you're at it. But if you would rather get some more life out of the parts you already own, it's worthwhile to go ahead and give it a good going through. You might save some serious money.