What does it mean when codes p0620 and p0404 comes up

Question

1. I don't what the codes mean and I checked alternator battery and everything was good but my car is slugish going up hill or after driving for a long time

Answer 1

P0404 EGR (exhaust gas recirculation) circuit range performance

P0620 Generator control circuit malfunction

With P0404 this is mostly a stuck closed EGR valve, Sluggish going uphill inspect the airfilter replace if necessary and do a MAF (mass aiflow cleaning) .