Problem Description and Possible Solution
The mass air flow sensor tends to fail causing poor fuel economy and Check Engine light illumination. The engine air filter should be replaced when the mass air flow sensor is replaced; a dirty filter can allow debris to damage the new sensor.
Problem DataRepairPal Verified
Average mileage: 40,000 (40,000–40,000)
7 people reported this problem
check engine light MAF sensor failure, dirty air filter, replaced cleared codes, problem solved
Mercedes Dealer serviced car, did not replace air filter, though regularly serviced there!!