Mass Air flow sensor

The MAF sensor is in the air intake tube. And there is a special spray for cleaning it. Pick it up at you local parts store.

Do you even know what a MAF is? There are no mechanical parts that move.

Hi Rowefast thanks for the response I understand that it's a filter with a sensor that may need cleaning. I need to get the car past emission inspection in MD I'm trying to resolve codes P0170 & P0173. The fuel pump was replaced with OE one and after 65 miles of hwy driving the light came CEL came back on. My previous MB (1986) didn't have one so you're right I really don't know what it is best s

P0170 MERCEDES-BENZ - Fuel Trim Malfunction Bank 1....Possible causes; Intake air leaks, Faulty front heated oxygen sensor, Ignition misfiring, Faulty fuel injectors, Exhaust gas leaks, Incorrect fuel pressure, Lack of fuel, Faulty Mass Air Flow (MAF) sensor, Incorrect Positive Crankcase Ventilation (PCV) hose connection.....Dirty air filter, air filter housing or Mass Air Flow (MAF) sensor, or faulty MAF sensor are common causes for the P0170 code......P0173 MERCEDES-BENZ - Fuel Trim Malfunction Bank 2...Possible causes; Intake air leaks, Faulty front heated oxygen sensor, Ignition misfiring, Faulty fuel injectors, Exhaust gas leaks, Incorrect fuel pressure, Lack of fuel, Faulty Mass Air Flow (MAF) sensor, Incorrect Positive Crankcase Ventilation (PCV) hose connection...Dirty air filter of faulty air flow sensor are common causes for the P0173 code of the problem.