DIY - Get rid of that P0420 - Catalyst System Efficiency Below Threshold Bank 1 | VW Vortex - Volkswagen Forum
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P0101, P2177, P0420...I give up. | VW GTI MKVI Forum / VW Golf R Forum / VW Golf MKVI Forum / VW GTI Forum - Golfmk6.com
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2003 new beetle convertible - code P0420 $10 Catalyst system effeciency below threshold bank 1 car only has 66k and runs
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