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    So many codes...where to begin

    My 6 has 189,000 miles, and I've loved every one of them. However, I'm currently having issues. There are 4 codes showing; P0421 warm up catalyst below threshold (bank 1), P031 warm up catalyst below threshold (bank 2), P2227 barometric pressure CKT range/performance, and P0455 evap system leak...
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