Hi
CEL came on the other day P0400 egr valve. The valve was stuck got it open, cleaned it but would not seal tight, I could blow air through it could hear air passing though. Today CEL came back with diffrent code P0410 secondary air.
Could this be related to EGR valve not closing tight?
Car is 2000 E320 4Matic 180k mi.
thanks

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1995 E320
1998 E320
1999 E320 4Matic
2000 E320 4Matic
2000 ML320
2007 C230 Sport
2003 Cadillac CTS