Owned Civic EX 1.8 2008 a month before yet a few days ago, the engine check light came on. As per the mechanic diagnosis, the catalytic converter needs to be clean. But one of my friend who owns civic for years is suggesting me to replace the cat converter as the problem will arise again and again. Well, it costs around $300 a considerable amount. I'm still confused about deciding between to get it serviced or replace.