Join Date: May 2007
Car: 2003 2.5 4EAT with AWP and 2002 3.0 L.L. Bean wagons.
Feedback Score: 0 reviews
I think your mechanic is wrong and whaty he told you is exactly the opposite of reality with our cars (I'm assuming you have an Outback. Year? Miles?)
P0420 is VERY RARELY a failing cat.
It is most commonly a failing oxygen sensor (front Subaru, rear any brand), vacuum leak, exhaust leak or what not.
Search that code on the forums and you'll find plenty of info.
Cats rarely fail without serious mechanical problems, I think your mechanic wants to give you an expensive repair bill.
Have you tried using the Google search bar at the top of the forum?
2003 Outback 2.5 wagon: "Kaylee". 162,000 and counting.
More rust than I care to think about. And leaking head gaskets. And electrical gremlins. Still flyin'.
2002 L.L. Bean Limited 3.0 Outback wagon: "Mal". 112,000 and counting.
Plenty of battle scars and fixing up the previous owner's neglect via Project Retrograde.