Join Date: Oct 2017
Location: Sweden, South part
Vehicle: 2002 SLK 200K , Silver metallic (Special edition)
Other Toys: Notable earlier cars: MGB, Triumph Spitfire, Porsche 914 & 944, Jeep, Bv202 & 206 :-)
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It's important to know that many fault codes tell that a value is out of range, but doesnt explain why. Here, the measured air mass value isn't what the ECU is expecting, no more but OTOH, no less. This means that a Engine that is slightly out of tune may create this condition. Therefore, making sure that the car is "in shape" is a good idea.
I would check spark plugs, compressor belt tension (belt, tensioner), check for clogged engine ventilation, check the fuel filter (old, new, when was it changed?) - basically do whatever it says in the service sheet (and by all means, check tyre pressures... this is not a complete joke ). Given the high consumption, I would check actual engine compression at same time as spark plugs is out.
If all this check out "good", fine. THEN, I would clean or worst case, renew the MAF.