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Mercedes-Benz
S500
13

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

Problem Description and Possible Solution

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.

Problem Data
RepairPal Verified
Average mileage: 116,846 (85,000–145,000)
7 model years affected: 1994, 1995, 1996, 1997, more1998, 1999, 2002
13 people reported this problem
Comments
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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.