P0420-Catalyst 1/1 Efficiency, P0430-Catalyst 2/1 Efficiency: Notes
WARNING: This page is about a different car, the 2004 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
All symptoms listed above are diagnosed using the same tests. The title for the tests will be P0420-CATALYST 1/1 EFFICIENCY.