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Resources for the Repair and Maintenance of your 1994 Mercedes-Benz S420

1994 Mercedes-Benz S420

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1994 Mercedes-Benz S420 Problems

Miscellaneous -- Verified

Problems with the pneumatic system can cause closing assist and door lock issues.

Miscellaneous -- Verified

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.

Engine -- Verified

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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.

Miscellaneous -- Verified

Glove box hinges, the center console armrest, and the cup holders break.

Electrical & Lights -- Verified

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.

1994 Mercedes-Benz S420 Questions and Answers

bolo1960, 1994 Mercedes-Benz S420, Petersburg, VA

Have replaced the theromstat and water hoses.

Visitor, 1994 Mercedes-Benz S420, Camden, NJ

it smoke when in park or stop at a light

Visitor, 1994 Mercedes-Benz S420, Denver, CO


DICSI, 1994 Mercedes-Benz S420, Denver, CO

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.

leonard196, 1994 Mercedes-Benz S420, Monmouth Junction, NJ

I am trying to locate the expansion valve on my 1994 s420. CAN ANYONE HELP ASAP.

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1994 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?

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

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