2004 Mercedes-Benz SLK32 AMG

2004 Mercedes-Benz SLK32 AMG

Overview

The 2004 Mercedes-Benz SLK32 AMG, a high-performance variant of the R171 SLK-Class, was produced for a limited time, combining the compact roadster’s agility with a potent AMG-tuned V6 engine. While generally considered a robust and well-engineered vehicle, like any performance car, it has specific areas that owners and technicians have noted for potential issues. This analysis focuses on documented reliability concerns beyond standard maintenance, providing insights into common problems, their symptoms, typical solutions, and estimated repair costs for this enthusiast-focused model. Understanding these potential pitfalls can help prospective buyers and current owners manage expectations and maintenance.

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Engine

3.2L Supercharged V6 (AMG)

Supercharger Belt Slippage

• Symptoms: Reduced engine power, whining noise from the engine bay, check engine light.
• Solution: Replacement of the supercharger belt and potentially tensioner pulley.
• Cost: $250 - $500

Intercooler Leaks

• Symptoms: Loss of boost pressure, rough idle, decreased engine performance, potential overheating.
• Solution: Repair or replacement of the intercooler and associated hoses.
• Cost: $500 - $1200

Oil Leaks (Valve Covers/Gaskets)

• Symptoms: Visible oil on engine components, burning oil smell, low oil level.
• Solution: Replacement of valve cover gaskets and/or other engine seals.
• Cost: $400 - $800

Transmission

5-Speed Automatic (AMG Speedshift)

Transmission Control Module (TCM) Failure

• Symptoms: Erratic shifting, failure to shift gears, ‘limp mode’ engagement, warning lights.
• Solution: Replacement or repair of the TCM.
• Cost: $800 - $1500

Solenoid Issues

• Symptoms: Harsh shifting, delayed engagement, transmission slipping.
• Solution: Replacement of faulty transmission solenoids.
• Cost: $500 - $1000

Suspension

AMG Sport Suspension

Front Control Arm Bushings

• Symptoms: Clunking noises over bumps, vague steering feel, uneven tire wear.
• Solution: Replacement of worn control arm bushings or complete control arm assembly.
• Cost: $400 - $700

Rear Spring Perch Corrosion

• Symptoms: Cracking noises from rear suspension, potential for spring failure.
• Solution: Repair or replacement of corroded spring perches.
• Cost: $300 - $600

Electrical

General Electrical System

Window Regulator Failure

• Symptoms: Power windows not operating, slow window movement, grinding noise.
• Solution: Replacement of the window regulator mechanism.
• Cost: $200 - $400

Headlight Ballast Failure

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

Exterior

Retractable Hardtop System

Hydraulic Leaks/Pump Failure

• Symptoms: Roof not operating, slow operation, fluid leaks under the car.
• Solution: Repair or replacement of hydraulic lines, pump, or cylinders.
• Cost: $1000 - $2500+

Microswitches/Sensors

• Symptoms: Roof failing to latch or unlatch, warning messages on the dashboard.
• Solution: Replacement of faulty microswitches or sensors.
• Cost: $200 - $500

Interior

General Interior Components

Seat Heater Elements

• Symptoms: Seat heaters not working.
• Solution: Replacement of the seat heating elements.
• Cost: $300 - $600

HVAC Blower Motor Resistor

• Symptoms: Fan only works on highest setting or not at all.
• Solution: Replacement of the blower motor resistor.
• Cost: $100 - $250

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Summary Verdict

The 2004 Mercedes-Benz SLK32 AMG is a desirable performance roadster with a strong AMG engine. While it offers an exhilarating driving experience, potential buyers and owners should be aware of specific reliability concerns. The supercharged V6, while powerful, can experience issues like belt slippage and intercooler leaks. The 5-speed automatic transmission, though generally robust, may encounter problems with its control module or solenoids. The complex retractable hardtop system is a notable area for potential expense, with hydraulic leaks and sensor issues being common. Electrical components, particularly window regulators and headlight ballasts, can also require attention. Despite these points, with diligent maintenance and addressing issues promptly, the SLK32 AMG can remain a rewarding vehicle.