Mercedes-Benz S420 Problem Report
Mercedes-Benz S420 Erratic Engine Operation and Poor Fuel Economy Due to Faulty Mass Air Flow Sensor
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.
veh had starting running rough and losing gas mileage can smell the strong ordor of fuel with white smoke coming out - Visitor
I was told that My mass air flow unit is going bad. Is there any way to clean it or do I just have to replace it. - Antonwilldoit
Was getting engine fault. Cleaned sensor located in driver side air intake using CRC MAF Sensor Cleaner purchased at Kragen (now O Reiley Auto Parts). Cleared fault using LED/ Pushbutton feature (may not be available on all models). Works perfectly. - tom93110
I have a similar problem, especially when the car sits for a while without driving. I always keep a can of MAS air spray in my car. By removing the cover over the MAS unit, I spray a small amount into the unit; it works like a charm. - Visitor
runs poorly, with rough idle, has no power when driving. How often should I spray the sensor and or do I need to change wires? - myscooter
I HAVE THE SAME PROBLEM ITS LIKE THE COMPUTER HAS TO FIGURE OUT WHAT TO DO WHEN YOU HIT THE PEDAL AND ONCE IT RELISES WHAT TO DO IT GOES LIKE A ROCKET! - mercman
Low MPG and terrible idle noises - Visitor
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something is wrong with my fuel line. The car drives fine & then just cuts off. I think its my...
it wont blow cool air all the time it will blow then quit what the problum
I have a bad fuel leak going on from the rear passenger side of my 95's420 mercedes . I suppose...