After a week of driving with engine light on, just got the word from the dealer that the 'cat' is "below threshold" and they recommend replacing it to the tune of $1100. Feeling gouged and wondering if anyone has experience with the same issue. For example aftermarket parts, whether or not it's best to bite bullet and have dealer do it, or to shop around. Any advice would be most welcome as I will be doing my best to lower the investment. The 2003 Accord has 204K and has served me well despite some bad luck. It's on its 5th windshield. Thanks for your thoughts.