2009 Mercedes GL450 P0410 code

I have had ongoing issues with this code and multiple attempts to remedy have not turned off CEL (multiple attempts to reset with code reader). I have replaced the secondary air pump, air check valves, inspected all hoses, replaced intake manifold actuator (plastic rod was broken), replaced fuse and relay to secondary air pump. We have verified functioning of above parts with cold engine start. Looking for any advice of what I could be missing. Car is driving perfect (never had any issues... 2009 Mercedes GL450 P0410 code

I have had ongoing issues with this code and multiple attempts to remedy have not turned off CEL (multiple attempts to reset with code reader). I have replaced the secondary air pump, air check valves, inspected all hoses, replaced intake manifold actuator (plastic rod was broken), replaced fuse and relay to secondary air pump. We have verified functioning of above parts with cold engine start. Looking for any advice of what I could be missing. Car is driving perfect (never had any issues...

2009 Mercedes GL450 P0410 code

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