Muffler and cat rattles - bad news??

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Author Message   Corey (Discobro) Senior Member Username: Discobro Post Number: 310 Registered: 12-2002 Posted on Thursday, January 08, 2004 - 12:02 am:    I recently have heard a rattle near my front muffler and cat (before the "Y"). Is this bad news? I also noticed a leak in that muffler on the front side of it probably from something poking it (and rust). I got a code of P0420 recently (Catalyst System Efficiency Below Threshold (Bank 1). Does this have anything to do with this?   Pugsly (Pugsly) Senior Member Username: Pugsly Post Number: 251 Registered: 11-2002 Posted on Thursday, January 08, 2004 - 03:07 am:    How many miles? The cats are covered up to 80k, I think?   Tbow (Tbow) Member Username: Tbow Post Number: 167 Registered: 12-2002 Posted on Thursday, January 08, 2004 - 09:37 am:    Yes, code would be related to the cat rattling. It must be a 1996 or newer because you have the OBDII system. Depending on the year you might want to check the emissions warranty, you might be covered. Regardless, there is no doubt you'll need new cats. There is a thread already that discusses your options, do a search on Catalytic Converters.   Corey (Discobro) Senior Member Username: Discobro Post Number: 316 Registered: 12-2002 Posted on Saturday, January 10, 2004 - 06:05 pm:    It is a 96 and 84k miles. I need a new muffler so can I (and where to) get a pre-built full exhaust from the Y back? And do I need the rear cat? Is there a sensor there?   Pugsly (Pugsly) Senior Member Username: Pugsly Post Number: 253 Registered: 11-2002 Posted on Saturday, January 10, 2004 - 06:36 pm:    A decent muffler shop should be able to hook you up - much cheaper than a genuine replacement. Or check out aftermarket stainless kit (like NRP).