2002 Mercedes-Benz SL55 AMG

The 2002 Mercedes-Benz SL55 AMG is a high-performance roadster that delivers exhilarating performance. While the SL55 AMG was available with only one engine option, the hand-built 5.4L Supercharged V8 (M113K), and one transmission option, the five-speed automatic (722.6), it is known for its powerful engine producing 493 horsepower and 516 lb-ft of torque. Owners love the car’s intoxicating blend of luxury and performance, but some dislike its complex electronics and potential for high maintenance costs.

Engine

5.4L Supercharged V8 (M113K)

• Supercharger Failure
  • Description/Symptoms: Reduced power, whining noise from the engine bay, potentially a check engine light.
  • Solution: Supercharger rebuild or replacement.
  • Estimated Cost to Fix: $2,000 - $5,000+
  • Recalls: None Found
• Intercooler Pump Failure
  • Description/Symptoms: Overheating of the supercharger, reduced power, especially in hot weather.
  • Solution: Intercooler pump replacement. Bosch 010 pump is a common failure.
  • Estimated Cost to Fix: $200 - $500+
  • Recalls: None Found
• Valve Cover Gasket Leaks
  • Description/Symptoms: Oil leaks visible on the sides of the engine, burning oil smell.
  • Solution: Valve cover gasket replacement.
  • Estimated Cost to Fix: $300 - $700+
  • Recalls: None Found
• Crankshaft Position Sensor Failure
  • Description/Symptoms: Engine stalling, rough running, no start condition.
  • Solution: Crankshaft position sensor replacement.
  • Estimated Cost to Fix: $150 - $400+
  • Recalls: None Found

Transmission

5-Speed Automatic (722.6)

• Conductor Plate Failure
  • Description/Symptoms: Erratic shifting, transmission stuck in limp mode, check engine light.
  • Solution: Conductor plate replacement, potentially valve body rebuild.
  • Estimated Cost to Fix: $800 - $2,000+
  • Recalls: None Found
• Torque Converter Failure
  • Description/Symptoms: Shuddering during acceleration, slipping between gears.
  • Solution: Torque converter replacement.
  • Estimated Cost to Fix: $1,000 - $3,000+
  • Recalls: None Found
• Valve Body Issues
  • Description/Symptoms: Hard shifting, delayed engagement, or no engagement.
  • Solution: Valve body rebuild or replacement.
  • Estimated Cost to Fix: $800 - $2,500+
  • Recalls: None Found

Suspension

• ABC (Active Body Control) System Leaks
  • Description/Symptoms: Car sitting low, especially overnight, ABC warning light, hydraulic fluid leaks.
  • Solution: Repair or replace leaking ABC struts, pump, valve block, or hydraulic lines.
  • Estimated Cost to Fix: $500 - $3,000+ per component
  • Recalls: None Found
• ABC Pump Failure
  • Description/Symptoms: ABC warning light, stiff ride, inability to adjust ride height.
  • Solution: ABC pump replacement.
  • Estimated Cost to Fix: $1,500 - $3,000+
  • Recalls: None Found

Electrical

• PSE (Pneumatic System Equipment) Pump Failure
  • Description/Symptoms: Malfunctioning door locks, trunk not opening, seat adjustments not working.
  • Solution: PSE pump replacement or repair.
  • Estimated Cost to Fix: $500 - $1,500+
  • Recalls: None Found
• Battery Drain
  • Description/Symptoms: Car battery draining overnight or within a few days of being parked.
  • Solution: Diagnose and repair the source of the parasitic draw. Common culprits include the PSE pump, instrument cluster, and alarm system.
  • Estimated Cost to Fix: $200 - $1,000+ (depending on the source of the drain)
  • Recalls: None Found
• Instrument Cluster Issues
  • Description/Symptoms: Pixel loss, incorrect readings, complete failure of the instrument cluster.
  • Solution: Instrument cluster repair or replacement.
  • Estimated Cost to Fix: $500 - $2,000+
  • Recalls: None Found

Exterior

• Convertible Top Malfunctions
  • Description/Symptoms: Top not opening or closing correctly, hydraulic leaks, error messages.
  • Solution: Repair or replace hydraulic cylinders, pump, or sensors.
  • Estimated Cost to Fix: $500 - $3,000+
  • Recalls: None Found

Interior

• Seat Control Module Failure
  • Description/Symptoms: Seats not adjusting correctly, memory functions not working.
  • Solution: Seat control module replacement.
  • Estimated Cost to Fix: $400 - $1,000+
  • Recalls: None Found

Summary:

The 2002 Mercedes-Benz SL55 AMG, while offering tremendous performance and luxury, is prone to various issues. The most significant concerns revolve around the ABC suspension system, the supercharged engine’s components, the transmission, and electrical gremlins. Repairs can be costly, particularly those involving the ABC system and engine. Potential buyers should be aware of these issues and factor in maintenance costs when considering purchasing one of these vehicles.