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 S600
Average mileage: 125,000 (125,000–125,000)
7 people reported this problem
1997 Mercedes-Benz S600 125,000 mi, Visitor
tried cleaning them, then replaced