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Problems for specific Mercedes-Benz S420 years:

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Most reported Mercedes-Benz S420 problems

 

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

24 Reports
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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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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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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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Glove box hinges, the center console armrest, and the cup holders break.
10 Reports
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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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High mileage vehicles may develop a leak from one or more of the transmission oil seals.

8 Reports
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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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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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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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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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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

The brakes may begin to squeak at about the 50 percent wear point. This is due to the size and material used for the brake pads and rotors.  The brake rotor surfaces become uneven, causing a lip to form at the outer edge. This will generally require replacement of the rotors when the pads are worn (pad life varies depending on driving style and terrain).

6 Reports
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Verified for the Mercedes-Benz S420

As brake fluid becomes dirty over time, it can cause a failure of the anti-lock brake system (ABS) modulator assembly. Our technicians recommend a complete brake system flush every two years to help prevent this issue.

6 Reports
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