P0410 Code on 2005 CL55 AMG - Secondary Air Injection Issue
The code initially appeared about a week and a half ago, but I cleared it thinking it might go away after the valve cover and intake gaskets work. It's now back and I'm trying to figure out if I caused this during my recent work or if the secondary air pump is actually failing.
Car has 155k miles, ABC suspension converted to coilovers, and overall runs strong despite this issue.
Has anyone else dealt with this? What was your fix? Should I first check the pump, relay, fuse, or check valves? Is it related to my recent spark plug/coil pack/gasket work?
Any advice greatly appreciated as I'd like to avoid unnecessary parts replacement.
Thanks!





