2009 Mercedes-Benz E500

2009 Mercedes-Benz E500

Overview

The 2009 Mercedes-Benz E500, part of the W211 generation, is generally considered a robust and well-engineered vehicle. It offers a blend of luxury, performance, and comfort, powered by a potent V8 engine. While Mercedes-Benz vehicles are known for their sophisticated engineering, like any complex machine, certain components can experience issues over time. This analysis focuses on documented, non-wear-and-tear related problems reported by owners and technicians, aiming to provide a clear picture of potential reliability concerns for this model year. Owners can expect a generally positive ownership experience, but awareness of common problem areas can aid in proactive maintenance and cost management.

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Engine

5.0L V8 (M113)

Oil Cooler Seals Leak

• Symptoms: Oil in coolant reservoir, coolant in oil, potential overheating.
• Solution: Replacement of oil cooler seals.
• Cost: $300 - $600

Intake Manifold Gasket Leak

• Symptoms: Vacuum leaks, rough idle, check engine light.
• Solution: Replacement of intake manifold gaskets.
• Cost: $400 - $800

Transmission

5-Speed Automatic (722.6)

Conductor Plate Failure

• Symptoms: Harsh shifting, transmission slipping, failure to engage gears, ‘limp mode’.
• Solution: Replacement of the transmission conductor plate and fluid service.
• Cost: $800 - $1500

Transmission Fluid Leaks

• Symptoms: Leaking fluid from transmission pan or cooler lines, low fluid level, shifting issues.
• Solution: Repair or replacement of leaking seals, pan gasket, or cooler lines.
• Cost: $200 - $500

Suspension

Standard Chassis

Air Suspension Compressor Failure (if equipped)

• Symptoms: Vehicle sagging, loss of ride height, compressor not engaging.
• Solution: Replacement of the air suspension compressor.
• Cost: $700 - $1200

Control Arm Bushing Wear

• Symptoms: Clunking noises over bumps, vague steering, uneven tire wear.
• Solution: Replacement of worn control arm bushings or entire control arms.
• Cost: $400 - $800

Electrical

General Electrical System

SAM (Signal Acquisition Module) Issues

• Symptoms: Intermittent electrical faults, malfunctioning lights, power window issues, warning lights.
• Solution: Diagnosis and potential repair or replacement of the SAM module.
• Cost: $500 - $1000

Keyless Go System Malfunctions

• Symptoms: Key fob not recognized, difficulty starting the vehicle, door handle sensors failing.
• Solution: Diagnosis and repair/replacement of related sensors or modules.
• Cost: $300 - $700

Exterior

Body and Trim

Sunroof Drain Clogs

• Symptoms: Water leaks into the cabin, musty smell, potential damage to electronics.
• Solution: Clearing of sunroof drain tubes.
• Cost: $100 - $250

Interior

Cabin Components

Seat Control Module Failure

• Symptoms: Power seats not functioning, memory seat settings lost.
• Solution: Replacement of the seat control module.
• Cost: $300 - $600

HVAC Blower Motor Resistor Failure

• Symptoms: HVAC fan only works on highest setting or not at all.
• Solution: Replacement of the blower motor resistor.
• Cost: $150 - $300

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Summary Verdict

The 2009 Mercedes-Benz E500 (W211) presents a generally reliable luxury sedan, particularly with its robust 5.0L V8 engine. The most commonly cited issues tend to be related to the transmission’s conductor plate and potential leaks from the oil cooler seals or intake manifold gaskets. Suspension components, especially if equipped with air suspension, can require attention. Electrical gremlins, often stemming from the SAM module, are not uncommon in vehicles of this era. While not immune to problems, addressing these potential issues proactively can ensure a continued enjoyable ownership experience. Regular maintenance and prompt attention to warning signs are key to maximizing the longevity and reliability of this sophisticated vehicle.