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P0411 and P0420 Codes

1606 Views 1 Reply 2 Participants Last post by  sheila
On Friday I had my 2014 Impala in the shop to have the High Pressure Fuel Pump and Catalytic Converter repaired to remedy 4 codes that were being thrown. Picked it up and the check engine light was off. Haven’t driven it til today and the check engine light is on again. Took it to the local Advace Auto Parts to check the code since the shop is closed and it is showing the codes P0411 and P0420. Any idea why it would still be showing these after the repairs were made?
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Dunno? P0411= air pump incorrect flow and p0420= faulty (below threshold) bank#1 cat.
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