Car Problem Reports

Mercedes-Benz S500 Faulty Mass Air Flow Sensor Causing Erratic Engine Operation and Poor Fuel Economy

Mercedes-Benz S500 Problem
10 Reports
Me Too

Model Years Affected: 1994, 1995, 1996, 1997, 1998, 1999, 2002

Average Mileage: 113,750 mi (85,000 mi - 145,000 mi)


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.

  • Visitor, , 128,000 mi

    Replaced the sensor two times now. Still have similar problem. I have narrowed it down as follows. Now problem occurs only in the morning. Car starts out all right. After I make a stop, the car stalls, and I have to take off slowly as the care may stop. So, now, when I come to a stop, I put it in neutral, give the car some gas, and then put it in drive, and then it will not stall. It will do this at various stops, until I reach my destination, which is about 9-miles away. After that when I go out to lunch, or go home in the evening, the problem does not occur.

    Flag This
  • Visitor, , 145,000 mi

    Car getting too much gas

    Flag This
  • Visitor, , 97,000 mi

    Car won't start, fuel line won't go beyond the yellow --

    Flag This
  •  Rookie

    car turn off,and won't start,no code showing,process elimination

    Flag This
Ask a Question