CEL is on and Autozone read gives P0171 (System Too Lean Bank 1), P0174 (System too Lean Bank 2), P2422 (Evaporative emission system vent valve stuck closed). Everything seems fine as far as how the car is running.

About 2 weeks ago after filling gas, my wife said the engine was turning but not starting and about 15 mins later it started.

Any ideas? thanks!

 

Did you ever figure this out? I have the same exact codes; car runs fine.

 

If you have a w204 would take a look at the evap purge valve which is just to the driver's side of the driver's side air intake hose. if you do a Search on line you will see DIY's for it and how to check if stuck.

 

I've had the check engine light on for about a month, and yesterday, when i finally decided to create a profile and respond to this thread, the CEL amazingly decided to go away on its own.
Thanks for the tip though, I will keep that in my back pocket if it ever comes back.