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

After driving the car for a week this was the only code P0410.
Testing the secondary air system found the problem, right side cylinder head ports are clogged.

Any ideas on cleaning them without removing cylinder head?

thanks

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

P0410 Secondary Air
Took off both shutoff valves. After 4 hrs. car running throwing everything I had in cabnet from carb cleaner, brake cleaner, paint reducer, seafoam, carving with coat hanger wire and drivng around the block on 1st gear to keep RPM high it finaly opened up exhaust fumes started coming out from both sides. Cleaned up both shutoff valves put it back together. It's been three days no CEL before it would come on right after the 2nd cold start.

Thanks

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

Glad you got yours fixed. You may want to check out this thread.

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