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Mercedes-Benz S500 Problems

Find the most common issues based on Mercedes-Benz S500 owner complaints.
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Most Common Mercedes-Benz S500 Problems

Problems with the pneumatic system can cause closing assist and door lock issues.
The relay which turns the airmatic suspension pump on may fail causing the pump to run continuously. This can result in failure of the pump motor or a dead battery as the pump motor will continue...
The door for the vanity mirror (or the frame for the door) can break; due to a redesign, the mirror "cassette" will need replacement.
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2 Known Mercedes-Benz S500 Brakes Problems

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 t...
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 hel...

6 Known Mercedes-Benz S500 Drive Train Problems

Leaks may develop from the differential cover and/or seals on high mileage or older vehicles. Our technicians recommend a complete reseal of the differential unit if these leaks are addressed.
A vibration felt through the center floor of the vehicle can be caused by cracked and/or shredded driveshaft flex discs, resulting in excessive driveshaft movement. If not repaired, damage to the...
The electrical connector at the automatic transmission may leak fluid. Over time leaking fluid could migrate through the wiring harness and damage the transmission control module. If that happe...

6 Known Mercedes-Benz S500 Electrical & Lights Problems

CD changers, command units, voice control units, PSE units, and Tele Aid units are prone to failure, especially in early models.
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.
A door control module/actuator may fail. Our technicians recommend finding an expert to repair them. Taking the door trim panels off requires expert knowledge because they can break and the piece...

10 Known Mercedes-Benz S500 Engine Problems

The crankshaft position sensor may fail. Symptoms of this are: The engine will crank—but not start—especially when the engine is warm. The car may start again if it is left to cool ...
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 engi...
An engine Oil leak may develop from the PCV vent housing on the valve cover and/or the inspection plate on the front of the engine.

1 Known Mercedes-Benz S500 Exhaust & Emissions Problem

Ports in the cylinder head related to the emissions air injection and EGR systems can clog; the cylinder head should be removed and the ports cleaned.

6 Known Mercedes-Benz S500 Heating & Air Conditioning Problems

The evaporator temperature sensor can fail, causing the AC compressor not to cycle. If the AC compressor does not turn on, the AC system will not blow cold air. If the compressor is stuck on, the a...
Other than a defective motor, a bad switch or blower motor resistor assembly can cause an inoperative heater blower motor.
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 re...

0 Known Mercedes-Benz S500 Maintenance Problems

10 Known Mercedes-Benz S500 Miscellaneous Problems

Problems with the pneumatic system can cause closing assist and door lock issues.
The door for the vanity mirror (or the frame for the door) can break; due to a redesign, the mirror "cassette" will need replacement.
The center console armrest can break. Replacement is commonly the recommended repair.

8 Known Mercedes-Benz S500 Suspension & Steering Problems

The relay which turns the airmatic suspension pump on may fail causing the pump to run continuously. This can result in failure of the pump motor or a dead battery as the pump motor will continue...
The active body control system can leak fluid from numerous areas, including the tandem pump, hydraulic lines, struts, and/or seals. If it is not repaired, the vehicle ride height could drop too lo...
Front thrust arm and control arm bushings can crack and sometimes tear completely. If this is not repaired quickly, damage to the front subframe unit will occur, which is very expensive to repa...

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Known Mercedes-Benz S500 Problems & Complaints

The relay which turns the airmatic suspension pump on may fail causing the pump to run continuously. This can result in failure of the pump motor or a dead battery as the pump motor will continue...
Problems with the pneumatic system can cause closing assist and door lock issues.
The center console armrest can break. Replacement is commonly the recommended repair.
The active body control system can leak fluid from numerous areas, including the tandem pump, hydraulic lines, struts, and/or seals. If it is not repaired, the vehicle ride height could drop too lo...
CD changers, command units, voice control units, PSE units, and Tele Aid units are prone to failure, especially in early models.
Front thrust arm and control arm bushings can crack and sometimes tear completely. If this is not repaired quickly, damage to the front subframe unit will occur, which is very expensive to repa...
Glove box hinges, the center console armrest, and the cup holders break.
Instrument cluster lenses break easily.
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 ...
Some models have tandem hydraulic pumps—one section for power steering and the other for suspension adjustment. These pumps are prone to leakage from either section.
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 s...
The head lamp wipers are easily damaged, especially by automatic car washes.
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 engi...
Other than a defective motor, a bad switch or blower motor resistor assembly can cause an inoperative heater blower motor.
Cup holders break easily, especially if sticky liquids are spilled into the cup holder mechanism.
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