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**kwmech** · 05-18-2017, 01:09 PM

Check the voltages of both the 02 sensors before you go throwing a few hundred dollars on a convertor. Maybe you knocked a small vac hose loose while changing the wires which would throw the voltages off

05-18-2017, 01:09 PM	#4
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,389	Re: P0420... Check the voltages of both the 02 sensors before you go throwing a few hundred dollars on a convertor. Maybe you knocked a small vac hose loose while changing the wires which would throw the voltages off