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Problems for specific Mercedes-Benz S420 years:

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Most reported 1998 Mercedes-Benz S420 problems

 

Verified for the Mercedes-Benz S420

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

24 Reports
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Verified for the Mercedes-Benz S420

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.

16 Reports
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Verified for the Mercedes-Benz S420

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.

14 Reports
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Verified for the Mercedes-Benz S420
Glove box hinges, the center console armrest, and the cup holders break.
10 Reports
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Verified for the Mercedes-Benz S420

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.

10 Reports
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Verified for the Mercedes-Benz S420

Due to wear, high usage vehicles can experience ignition lock and tumbler failures. The ignition lock cylinder will generally require replacement to correct this concern.

9 Reports
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Verified for the Mercedes-Benz S420

High mileage vehicles may develop a leak from one or more of the transmission oil seals.

8 Reports
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Verified for the Mercedes-Benz S420

A fluid leak from the front of the vehicle may be a result of a worn steering dampening shock. Our technicians tell us that if a leak is noted from the dampening shock it should be replaced.

8 Reports
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Verified for the Mercedes-Benz S420

The electronic throttle assembly may suffer an electrical failure. It is often cheaper to send the valve to a service center for repair that to purchase a new part.

7 Reports
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Verified for the Mercedes-Benz S420

Other than a defective motor, a bad switch or blower motor resistor assembly can cause an inoperative heater blower motor.

7 Reports
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Verified for the Mercedes-Benz S420

The climate control system can fail or perform erratically due to internal problems with the climate control button electrical contacts. Replacement of the climate control assembly is commonly required to correct this problem.

7 Reports
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Verified for the Mercedes-Benz S420

A cracked or broken heater core outlet housing can cause a coolant leak near the bulkhead (firewall). Our technicians remind us that coolant leaks should be repaired in order to avoid overheating the engine due to coolant loss.

7 Reports
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Verified for the Mercedes-Benz S420
Oil feed tubes break and fall into the crankcase (engine) and the tappet becomes noisy (ticking), resulting in degraded idle quality. Our technicians recommend replacing all of the tubes at the same time, broken or not.
7 Reports
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Verified for the Mercedes-Benz S420

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.

6 Reports
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Verified for the Mercedes-Benz S420

One or more of the following steering linkage components may wear prematurely;  tie rod ends, drag link, or idler arm. Our technicians remind us the wheel alignment should be checked and adjusted if any of these items are replaced.

6 Reports
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