2006 Mercedes-Benz E320

2006 Mercedes-Benz E320

Overview

The 2006 Mercedes-Benz E320, part of the W211 generation, is generally regarded as a solid luxury sedan, particularly known for its comfortable ride and refined interior. This model year saw the introduction of the 3.0L V6 turbodiesel engine (OM642), which offered a good balance of performance and fuel efficiency. While Mercedes-Benz vehicles are known for their advanced engineering, like any complex machine, they can experience specific issues as they age. This analysis focuses on documented common problems beyond routine maintenance, providing insights into potential areas of concern for owners and prospective buyers of the 2006 E320.

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Engine

3.0L V6 Turbodiesel (OM642)

Intake Manifold Runner Failure

• Symptoms: Check engine light, rough idle, loss of power, rattling noise from the engine bay.
• Solution: Replacement of the intake manifold or specific runner actuators.
• Cost: $500 - $1200

EGR Valve Issues

• Symptoms: Check engine light, poor performance, increased emissions, rough idling.
• Solution: Cleaning or replacement of the EGR valve.
• Cost: $300 - $700

Glow Plug Failure

• Symptoms: Difficulty starting in cold weather, check engine light.
• Solution: Replacement of faulty glow plugs and potentially the control module.
• Cost: $400 - $900

Transmission

5-Speed Automatic (722.6)

Transmission Control Module (TCM) Failure

• Symptoms: Erratic shifting, harsh shifts, transmission not engaging gears, limp mode.
• Solution: Replacement of the TCM.
• Cost: $800 - $1500

Conductor Plate Issues

• Symptoms: Similar to TCM failure, including shifting problems and error codes related to speed sensors.
• Solution: Replacement of the conductor plate assembly.
• Cost: $600 - $1100

Suspension

Standard Chassis

Air Suspension (AIRMATIC) Leaks

• Symptoms: Vehicle sagging on one or more corners, uneven ride height, compressor running excessively.
• Solution: Repair or replacement of leaking air springs, lines, or compressor.
• Cost: $700 - $2000+

Control Arm Bushing Wear

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

Electrical

General Electrical System

SAM Unit (Signal Acquisition Module) Corrosion

• Symptoms: Intermittent electrical failures (lights, wipers, windows), warning lights, CAN bus errors.
• Solution: Cleaning and sealing the SAM unit, or replacement if severely damaged.
• Cost: $500 - $1500

Window Regulator Failure

• Symptoms: Power windows not operating, slow operation, or falling into the door.
• Solution: Replacement of the window regulator mechanism.
• Cost: $250 - $500

Headlight Ballast Failure

• Symptoms: Xenon headlights not turning on or flickering.
• Solution: Replacement of the headlight ballast.
• Cost: $300 - $600

Exterior

Body and Trim

No widespread issues reported.

• Symptoms: N/A
• Solution: N/A
• Cost: Varies

Interior

Cabin Components

Sunroof Drain Clogs

• Symptoms: Water leaks into the cabin, musty smell, potential damage to electronics.
• Solution: Clearing of the sunroof drain tubes.
• Cost: $100 - $300

Heated Seat Element Failure

• Symptoms: Heated seats not working.
• Solution: Replacement of the seat heating elements or associated wiring.
• Cost: $300 - $600

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Summary Verdict

The 2006 Mercedes-Benz E320 (W211) offers a compelling blend of luxury and performance, especially with its efficient turbodiesel engine. While generally reliable, potential owners should be aware of specific common issues. The diesel engine can face problems with the intake manifold, EGR valve, and glow plugs. The transmission, particularly the 5-speed automatic, may experience issues with its control module or conductor plate. Suspension components, especially the AIRMATIC system, are prone to leaks and wear. Electrical gremlins, often stemming from the SAM unit or window regulators, are also noted. Despite these potential concerns, many issues are repairable, and proactive maintenance can mitigate some risks. Overall, the E320 remains a desirable vehicle, but buyers should budget for potential repairs, especially on higher-mileage examples.