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I recently purchased a 1998 Toyota Sienna. After driving it 800 miles on a road trip the code P0420 (catalytic system efficiency below threshold)came up along with P0115 (engine coolant temperature circuit). I am sure I need a new catalytic converter as the exhaust emissions are moderate. I am going to assume that the PO115 code which is telling me that I need to change put a circuit that reads my engine coolant was triggered by the P0420 code and perhaps a false code? My question is has anyone seen this if so please share your story. Also I know catalytic converter are not cheap however is there a way to get one less expensive? Thanks