A faulty mass air flow (MAF) sensor can cause erratic/rough engine operation and fuel economy issues. Since this sensor measures the actual amount of air entering the motor, when it fails, the engine control module (ECM) takes the wrong information and delivers incorrect volumes of fuel to the cylinders.
Erratic Engine Operation and Poor Fuel Economy Due to Faulty Mass Air Flow Sensor on Mercedes-Benz SL500
Average mileage: 120,500 (120,500–120,500)
14 people reported this problem
1995 Mercedes-Benz SL500 120,500 mi, Visitor
I think this may be my problem. Just got the car from an auction. Rode well for a bit, but now shifts and revs irrationally - will see if this is the culprit. Thanks for the tip
Replaced Mass Air Flow Sensor unit, light still on.