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Yes thats it
The OVP would affect the cold start issue but not necessarily warm power loss.
Though it may I just don't know that.
If it goes bad the expensive systems it protects like fuel injection computer, ABS systems...I'm not really familiar with your engine (m117 right) ... will stop functioning. There are a number of things that could be affecting cold start problems OVP is one of them and is difficult to test. Having a good spare OVP never killed any Benz owner that I know of though.
Other components are easier to test like the water temp sensor but the warm power loss makes it a lot harder to pin the issue on one of these.
Possibly a bad EHA?
The comment about throwing parts at it is something you could easily fall into with these diverse symptoms. And
Maybe you have some more specific symptoms...
- Does the exhaust seem overly rich?
- What is cold idle vs. warm idle?
- Is the power loss on hills all the time or intermittent when warmed above 80°C?
- Any other symptoms (aside from cruse control) like an ABS light on?
Testing that Cat seems like a good idea as well short of more specific symptoms.
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