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Mercedes-Benz S350 Problems

Find the most common issues based on Mercedes-Benz S350 owner complaints.
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Most Common Mercedes-Benz S350 Problems

On vehicles with airmatic suspension, the airmatic pump relay can stick, causing a dead battery, because the pump continues to operate when it should be shut off. Eventually, the pump will fail; th...
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...
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...
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2 Known Mercedes-Benz S350 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...

5 Known Mercedes-Benz S350 Drive Train Problems

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...
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.
The bushings for the shifter lever wear out to the point where they break and fall out. This causes excessive movement (loose feel) in the shifter lever and a clanging-type noise when changing gears.

6 Known Mercedes-Benz S350 Electrical & Lights Problems

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.
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.
The ESP and BAS warning lights may illuminate due to a failed brake light switch. Replacement of the failed switch should correct this concern.

10 Known Mercedes-Benz S350 Engine Problems

The engine may develop a stalling and/or no start condition due to a failed crankshaft position sensor.
Oil leaks can develop around the oil filter housing.
Fuel leaks can develop around the high pressure fuel injection pump.

0 Known Mercedes-Benz S350 Exhaust & Emissions Problems

6 Known Mercedes-Benz S350 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...
A refrigerant leak may develop from one or more of the following AC components: AC compressor, hose manifold for the compressor, or the evaporator core. The loss of refrigerant can cause poor AC p...
Other than a defective motor, a bad switch or blower motor resistor assembly can cause an inoperative heater blower motor.

0 Known Mercedes-Benz S350 Maintenance Problems

10 Known Mercedes-Benz S350 Miscellaneous Problems

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.
The door for the vanity mirror (or the frame for the door) can break; due to a redesign, the mirror "cassette" will need replacement.
Instrument cluster lenses break easily.

8 Known Mercedes-Benz S350 Suspension & Steering Problems

On vehicles with airmatic suspension, the airmatic pump relay can stick, causing a dead battery, because the pump continues to operate when it should be shut off. Eventually, the pump will fail; th...
The lower control arm bushings can wear and crack, resulting excessive movement at the control arm pivot point, leading to irregular and premature tire wear. Worn Ball joints can also cause similar...
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.

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Known Mercedes-Benz S350 Problems & Complaints

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 repair...
The engine in the 2005-2008 Mercedes S350 is known by Mercedes Benz to have issues due to a poorly manufactured gear on the balance shaft (also known as the counter-rotating assembly). Since the ba...
Instrument cluster lenses break easily.
Glove box hinges, the center console armrest, and the cup holders break.
Problems with the pneumatic system can cause closing assist and door lock issues.
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.
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...
The head lamp wipers are easily damaged, especially by automatic car washes.
The engine may develop a stalling and/or no start condition due to a failed crankshaft position sensor.
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.
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.
Vehicles with automatic level control that ride harshly in the rear (no give in the suspension) may have one or both dampening actuators which have failed. It is commonly recommended the actuat...
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