There are quite a number of things that can cause those codes. Cleaning the MAF will do no harm, but I wouldn't start replacing parts hoping for a cure. First get the car scanned properly with a quality Mercedes or DRB III tool. If you haven't access to something other than a generic OBD II scanner it would be best to take the car to an independent garage that specializes in European imports and let them scan it. A good scan should get you headed in the right direction; MAP sensor, throttle position sensor, thermostat, air or coolant sensors, several different possibilities in the exhaust system. Get it scanned.