Mercedes-Benz 400SEL Repair and Maintenance
A guide to problems, costs, maintenance and repair for your Mercedes-Benz 400SEL
Verified by mechanics, reported by drivers like you
Ask a mechanic in our community
Mercedes-Benz 400SEL ProblemsFaulty Mass Air Flow Sensor Causing Erratic Engine Operation and Poor Fuel Economy
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.
The lower control arm bushings can wear and crack, resulting excessive movement at the control arm pivot point, leading to irregular and premature tire wear. Worn Ball joints can also cause similar tire wear symptoms. I some cases it may be necessary to replace the lower control arm, including bushings & ball joint to correct this concern.
Mercedes-Benz 400SEL QuestionsMy dashboard light is off on my 400SEL. How do I fix it? (3 answers)
ok hello i have a 1993 400sel it has a problem with spark plugs, I replaced with new ones and the car is backfiring. i used ngk preset spark plugs, it was running fine for a few days when i was driving it around the block, but now it has began backfiring and will not fully start... I just bought ...
sometimes they work and at times do not work.