Hello all, this is my first time in this web site since a co-worker told me about it couple of days ago. I need you guys help please. I have a 2005 C230 Compressor, since new, and the current mileage is about 37000 mile. I'm out of the warranty. About Two weeks ago the check engine lite came on, and I also noticed that when I removed the fuel cap to refuel the tank, there was no air pressure coming out of the gas tank. Are these two problems related? or individually problem?

Please tell me how do I fix it.

Thank you