Erratic Engine Operation and Poor Fuel Economy Due to Faulty Mass Air Flow Sensor on Mercedes-Benz 600SEL

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: 119,000 (85,000–137,000)
2 model years affected: 1992, 1993
6 people reported this problem
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mass air flow sensors allowing too rich a fuel mixture causing engine to run rough when warm. replaced mass air flow sensors. Dealer price near $1,500!