Chevrolet HHR P Codes (Powertrain) P0400 - P0499 P0420

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Code P0420

2008 CHEVROLET HHR
2008 Hhr Ls. Code P0420 Keeps Coming Back. Started After I Replaced Cracked Flex Pipe With New Eastern Catalytic Eco-gm #50459 Catalytic...
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Asked by bikmop13

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