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Keys to successful Catalytic Converter repair:, 1.Check for TSB's., 2.Correct all other engine trouble codes., 3.Check or replace all O2 sensors., 4.De-Carbonize all engines over 80,000 miles., 5.Inspect for head and intake gasket leaks., 6.Check EGR system and clean ports of excess carbon build up., 7.Inspect and test fuel pressure., 8.Leaking injectors., 9.Check for heavy oil usage., 10.Monitor fuel trim for signs of excessive correction by the PCM., 11.DO NOT USE silicone sealers., 12.Reset all monitors and Drive Cycle test., 13.PCM Re-flash if needed., 14.Fill out the warranty card, 15.What was the initial problem that prompted you to change the catalytic converter?, 16.Did you have the work done by a professional?, 17.What was the millage on the vehicle when work was done?, 18.Plugs wires O2 sensors bring up issues with catalytics for vehicles over 100K miles., 19.Toyotas once the catalytic is replaced the ECM brain module must be reset., 20.Catalytics don't go bad by themselves.,