2007 SL550 Check engine light - P0455 ??
 

driving home from work and check engine light just came on.
got home and i read the code which is P0455 - Major leakage in purge system / Hose in system not connected or filler cap open.

anybody has any idea where to start checking?

thank you!

I'd start with the fuel filler cap. Make sure it's on tight by removing and replacing it. Clear the code and drive. If the same code recurs, replace the cap before moving on to the evap system hoses.