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I have a p0420 code for my 2000 civic (1.6l engine, not vtec), but also
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P0420 Catalytic Converter exhaust manifold Replace 1996-2000 Honda
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I have a P0420 code for my 2000 civic (1.6L engine, not vTec), but also
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P0420 in 00 Civic EX - Honda-Tech - Honda Forum Discussion
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Honda civic 2010 catalytic converter cleaning code P0420 with Seafoam