2008 Mercedes-Benz CLS500

2008 Mercedes-Benz CLS500

Overview

The 2008 Mercedes-Benz CLS500, part of the C219 generation, is a luxury grand tourer known for its distinctive styling and potent performance. Powered by a robust 5.0-liter V8 engine, it offers a refined driving experience. While generally well-regarded for its build quality and comfort, like any vehicle of its age and complexity, it can experience specific issues. This analysis focuses on common mechanical and electrical concerns reported by owners, excluding routine maintenance. Understanding these potential problem areas can help prospective buyers and current owners manage expectations and maintenance costs for this sophisticated German automobile.

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Engine

5.0L V8 (M113)

Oil Cooler Seals Leak

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

Intake Manifold Gasket Leak

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

Camshaft Position Sensors Failure

• Symptoms: Check engine light, rough idle, stalling, poor performance.
• Solution: Replace faulty camshaft position sensors.
• Cost: $200 - $400

Transmission

5-Speed Automatic (722.6)

Transmission Control Module (TCM) Failure

• Symptoms: Harsh shifting, slipping gears, limp mode, transmission warning light.
• Solution: Replace or repair the TCM.
• Cost: $800 - $1500

Conductor Plate Issues

• Symptoms: Erratic shifting, no gear engagement, transmission warning light.
• Solution: Replace the conductor plate and associated sensors.
• Cost: $600 - $1000

Suspension

AirMatic Suspension

Air Strut Leaks

• Symptoms: Vehicle sagging on one or more corners, uneven ride height, compressor running excessively.
• Solution: Replace leaking air struts or air springs.
• Cost: $700 - $1500 per corner

Air Compressor Failure

• Symptoms: Vehicle does not raise, compressor makes noise but no air is delivered, warning light.
• Solution: Replace the AirMatic compressor.
• Cost: $500 - $900

Standard Suspension

No Major Issues

• Symptoms: No widespread issues reported.
• Solution: No widespread issues reported.
• Cost: N/A

Electrical

General Electrical System

Window Regulator Failure

• Symptoms: Power windows not operating, slow operation, grinding noises.
• Solution: Replace the window regulator mechanism.
• Cost: $300 - $500 per window

Headlight Ballast Failure

• Symptoms: Xenon headlights not turning on or flickering.
• Solution: Replace the headlight ballast unit.
• Cost: $200 - $400

Keyless Go System Malfunctions

• Symptoms: Difficulty starting the car, door handles not recognized, intermittent operation.
• Solution: Diagnosis and potential replacement of sensors or control modules.
• Cost: $400 - $1000

Exterior

Body and Trim

No Major Issues

• Symptoms: No widespread issues reported.
• Solution: No widespread issues reported.
• Cost: N/A

Interior

Cabin Electronics and Comfort

Seat Control Malfunctions

• Symptoms: Power seats not adjusting, memory functions failing.
• Solution: Diagnosis and repair/replacement of seat control modules or motors.
• Cost: $300 - $700

HVAC Blower Motor Resistor Failure

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

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Summary Verdict

The 2008 Mercedes-Benz CLS500 is a luxurious and powerful vehicle, but its advanced systems can lead to specific reliability concerns as it ages. The 5.0L V8 engine is generally robust, but leaks from oil cooler seals and intake manifold gaskets are common. The 5-speed automatic transmission, while durable, can suffer from TCM or conductor plate issues. The optional AirMatic suspension is a significant point of potential expense, with leaks in struts and compressor failures being prevalent. Electrical gremlins, such as window regulators and headlight ballasts, are also noted. Interior components like seat controls and HVAC resistors can also require attention. Despite these potential issues, many CLS500s remain reliable with diligent maintenance and prompt repair of known faults.