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Check your transmission fluid first. Make sure your at the correct level.
Engine Cooling fan or interior blower fan? Engine cooling fan continuous operation even when engine off and key off?
Have you had a professional look at it? Sounds like a drivetrain issue. Check axles, bearings, and front differential fir looseness and play.
Is it automatic or manual? Slipping automatic transmission will feel like your car is going in neutral during acceleration thus increasing the rpm and a non shifting auto transmission will have your rpm really high but not pick up speed.
I remember seeing a service bulletin for Audio/Command wiring harness going bad on these. Maybe covered under warranty. check with your local mercedes benz specialist or dealer.
First check tire condition. Is the threads even, is it worn? Also have your wheels balanced. Second check your steering and suspension components for looseness or worn bearings.
Have your oil pressure checked. you may have a bad oil pump. There is a bulletin for oil light flickering if my memory serves me right, but that is just for a bad connection to the oil pressure sensor and not cause any knocking noise.
You will need a wiring diagram to see how this is hooked up. Have a technician diagnose it for you. Most likely you have a power line shorted directly to your pump bypassing relays and air suspension fuse. Or you may have a leak in your air suspension lines and air strut continuously running your pump.
These codes indicates that your engine is running "rich". This means your o2 sensor senses more fuel less air. check your air intake up to the throttle body for obstruction(air filter, mass air flow sensor and screen, hoses etc.) Its possible that injectors could be leaking into the cylinder instead of atomizing and spraying properly. double check your new fuel regulator as well if its leaking fuel into the vacuum hose to intake. How does it run? does it sputter/hesitate/misfire?
New Oil pan from your local dealer is $630. labor $600 @ $85 labor rate. check labor rate in your area or shop of choice. plus the cost of oil and gasket. Prices will vary from shop to shop but should be around this ball park. dealer of course is much more. Find a reputable shop here on repair pal and consult with them. :) goodluck!