Originally Posted by violato

My engine check light recently went off, it gave me code P0420 which means my catalytic converter need to be replaced. On the other hand, few months I had problems with my TL where I cannot start my engine, it happens several times in some random times. The problem goes away by itself after about a month. I just wondering if fouled spark plugs might caused that and reduce the efficiency of fuel-air mixtures. Do you think if I replace my spark plugs might fix the problem? I haven't change my spark plugs for at least 50k, maybe more (since I bought the car used 3 years ago).

Also, I call Acura dealer, they wanted to charge me $1373 for the cat (part #18160P8C305) and 1.5 hours ($150) for the labor. I have a local auto shop quoted me $460 including labor. Do you think that's a fair price? how about if I bought the part online (I've seen it goes for around $150 for EASTERN DIRECT FIT CATALYTIC CONVERTER). Do you guys know if that aftermarket cat converter is OBDII compliance?

I just had my emission test this year and it won't due until 2010. Do you think I should wait on replacing the cat converter? at this time of year, it's hard to come up with that much extra money. Thanks in advance for answering my question.