Erratic Engine Operation and Poor Fuel Economy Due to Faulty Mass Air Flow Sensor on Mercedes-Benz 500SEL

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.

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Average mileage: 100,000 (100,000–100,000)
2 model years affected: 1992, 1993
3 people reported this problem
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problem details
1993 Mercedes-Benz 500SEL 100,000 mi,
Erratic idle when idling. back fires through the exhaust.