Mercedes-Benz 400E Repair and Maintenance
A guide to problems, costs, maintenance and repair for your Mercedes-Benz 400E
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Mercedes-Benz 400E 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 volume of fuel to the cylinders.
Internal and External engine oil & coolant leaks can develop from the head gasket and/or timing cover gasket; these leaks should be repaired before the engine oil and coolant intermix which can result in severe engine damage.
One or more blend door vacuum actuators may fail resulting in the incorrect output temperature from the HVAC system. Failed actuators will require replacement to restore proper HVAC operation.
Mercedes-Benz 400E QuestionsWhat is kit number for electronic connector module? (1 answer)
Without holding the switch down to close and turn the key on and off