Problems with the pneumatic system can cause closing assist and door lock issues.
Resources for the Repair and Maintenance of your Mercedes-Benz S420
Mercedes-Benz S420 Models:
Mercedes-Benz S420 Problems
One or more door windows may stop working due to a failed window regulator. Replacement of the failed regulator will be necessary to correct this concern.
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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 engine wiring can degrade because the insulating material falls off leaving the bare wire exposed. This can cause many problems depending on which wires are exposed and what they touch.
Glove box hinges, the center console armrest, and the cup holders break.
Mercedes-Benz S420 Recalls (Recent)
Mercedes-Benz S420 Questions and Answers
Have replaced the theromstat and water hoses.
it smoke when in park or stop at a light
THE ABS LIGHT SAYS ON. AND THE ODOMETER STOPPED WORKING. PLEASE HELP. THANK YOU!
the odometer stop working. what cause it to stop? how do you fix it. the odometer just stop and resetting the trip meterdidnt help. need quick answer.
Mercedes-Benz S420 Reviews
the heater valve blowing warm air out of the vents and air condition works off and on. I was told if I by pass the heater valve Ill have good air condition but no heat until I replace the heater valve. rather have cold then heat right now. And I was told I can rebuild the heater valve, so 1, how do I bypass the heater valve and 2 is there a kit to rebuild the heater valve and where do I buy it?
what cause my S420 Mercedes to lose power when accelerate from stop it sound like the plug missing fire it does it after driven a few miles stopping to a stop it get worse as I go along and stop at a red light or stop for any purpose.Sometimes when I shut car off and let engine cool down about30 to 45 minutes the car will run better.
heater dont work and shifter dont work it go in different spot drive is revers 3 is drive. what can i do.
My asr light is,on what is the problem and cost
I like this car, it is a 1994 S420, I had it for 6 years the main problem was the transmition, I have to build it twice. It has some electrical and minor michanical problems like any other cars the window motor has to be replaced twice, the heater/AC fan stopped workig for no reason, the sun roof gets stuck sometimes, the seats had some movement problem. Driving is enjoyable, engine is super power and very comfortable