Just got the p0410 today. Car isn't under warrentee, and for the random occurrence of the light, all I'm interested in knowing is if its a really big deal not to replace it. Besides cleaner air coming out of the exhaust for a few minutes, is it really going to damage the car if i don't replace anything? I'd much rather put that 300 towards an ECU flash or exhaust, and if this isn't hurting the cars performance or safety, i can't justify spending that much on something that doesn't need to be fixed. Then again, if the car will blow up 300 miles down the road, i'd like to get those parts