1998 Mercedes-Benz S420 Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 1998 Mercedes-Benz S420

1998 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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1998 Mercedes-Benz S420 Reviews

OVERALL, THIS IS ONE OF THE BEST HANDLING CARS THAT I'VE EVER OWNED. I'VE OWNED A Z-28 CAMARO, A VOLVO, A LEXUS AND ABOUT 7 TOYOTA SUVs. THE BRAKING IS INCREDIBLE AND THE DRIVE IS LIKE BUTTER. WHAT DRIVES ME NUTS IS THE GASOLINE SMELL IN THE COMPARTMENT PRESUMABLY FROM THE NEW CATALYTIC CONVERTERS WE JUST INSTALLED (FOR THE 2ND TIME). THE STEERING WHEEL PUMP HAS HAD TO BE REPLACED (ALSO FOR ...

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