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    3.2volts on first O2 with p0420 code?

    2008 Corolla with 136k miles. PO said he swapped a hollowed out cat system with one from a junk car. Just got it yesterday, and I hooked up my OTC scanner with live data. The code is p0420, the first sensor reads ~3.2V steady and the second O2 reads between .1 and .9 but changes very quickly...
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