P0420=Bank 1 catalyst system efficiency is below the acceptable threshold P0430=Bank 2 catalyst system efficiency is below the acceptable threshold There are many posts that deal with these codes, here is one of them: http://www.contour.org/ubbthreads/showflat.php?Cat=&Board=trouble&Number=53534If you use the search feature, you will find a LOT more.
96 Contour SE
Duratec V6 24-valve 2.5L ATX
108,000 mi.
Replaced: crankshaft w/ DMD, EGR valve (clogged), EVR, DPFE, PCV valve, evap emissions hose & tube (cracked), window regulator (broken), LH & RH PCV tubes, UIM gasket (leak), ignition coil
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