The little engine-shaped yellow light in the speedometer display on my 09 Clubman JCW is lit, but not flashing. According to the manual, it indicated that the engine isn't operating at full power.

Anyone have any insight into this? Resetting, or diagnostics?

 

Nevermind ... The turbo is coming apart & blowing hot exhaust onto the valvecover (melting some of it. There's a new turbocharger installation & some gasket & valve cover replacement in my future (this weekend).

 

Yes, the half yellow engine light indicator means you're not operating at full power and are most likely in limp mode. Sorry to hear about the turbo issue. We have turbochargers HERE and valve cover HERE if needed. Good luck and if you need anything just let me know.