1997 Mercedes-Benz S420 Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 1997 Mercedes-Benz S420

1997 Mercedes-Benz S420 Problems

Closing Assist/Door Lock Issues Due to Pneumatic System Problems

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

Faulty 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.

Insulation Degrades on Engine Wiring Harness and Leaves Conductors Exposed

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.

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1997 Mercedes-Benz S420 Questions

My 2 side air vents blow hot air when a/c is on while center vents blow cold. (1 answer)

How ca I fix this to get cold air out the side vents. I checked the fuses and they are good. Even when weather is cold they still blow hot air so is not a vent flow problem.

What is the procedure? (1 answer)

For getting the drivers door panel off to gain access to the window regulator?

how to replace hood hinges (2 answers)

im trying to find the easiest way to remove and replace the hood hinges after a hood blow off

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