2002 Mercedes-Benz ML55 AMG

The 2002 Mercedes-Benz ML55 AMG is a performance SUV that blended luxury with a potent V8 engine and sporty handling. It came standard with a 5.5L V8 engine that produced 342 horsepower and 376 lb-ft of torque. The ML55 AMG only came with a 5-speed automatic transmission. Owners appreciate its powerful engine, luxurious interior, and relatively unique performance SUV status for its time. Some downsides often cited include higher running costs compared to non-AMG models, dated technology, and potential for expensive repairs due to the age and complexity of the vehicle.

Engine

5.5L V8 (M113)

• Oil Leaks
  • Description/Symptoms: Oil leaks are common as the engine ages. The valve cover gaskets, rear main seal, and oil pan gasket are frequent culprits. Symptoms include visible oil leaks on the engine or ground, burning oil smell, and low oil level.
  • Solution: Replace the leaking gaskets or seals. Thoroughly clean the affected area after the repair.
  • Estimated Cost to Fix: $150 - $500+ depending on the location and severity of the leak.
  • Recalls: None Found
• Mass Air Flow (MAF) Sensor Failure
  • Description/Symptoms: The MAF sensor can fail, causing rough idling, poor acceleration, decreased fuel economy, and a check engine light.
  • Solution: Replace the MAF sensor with a new or remanufactured unit.
  • Estimated Cost to Fix: $150 - $400
  • Recalls: None Found
• Catalytic Converter Failure
  • Description/Symptoms: Catalytic converter failure can result in reduced engine performance, a rattling noise from the exhaust, and a check engine light related to emissions.
  • Solution: Replace the faulty catalytic converter(s).
  • Estimated Cost to Fix: $800 - $2000+ (depending on how many are replaced and if it’s OEM or aftermarket).
  • Recalls: None Found

Transmission

5-Speed Automatic (722.6)

• Transmission Valve Body Issues
  • Description/Symptoms: The 722.6 transmission is known for valve body issues as it ages. Symptoms can include harsh or delayed shifting, slipping between gears, and failure to shift.
  • Solution: Replacing or rebuilding the valve body is the typical solution. Flushing the transmission fluid regularly can help prevent this issue.
  • Estimated Cost to Fix: $800 - $2000+ for valve body replacement or rebuild.
  • Recalls: None Found
• Conductor Plate Failure
  • Description/Symptoms: The conductor plate within the transmission can fail, leading to erratic shifting or a complete loss of gear engagement.
  • Solution: Replace the conductor plate and potentially the associated solenoids.
  • Estimated Cost to Fix: $500 - $1500
  • Recalls: None Found

Suspension

• Air Suspension Issues (if equipped, aftermarket)
  • Description/Symptoms: If the vehicle has been converted to air suspension (not factory), components such as the air struts, compressor, and air lines can leak or fail. This can result in a sagging vehicle, a noisy compressor, and ride height errors.
  • Solution: Replace the leaking or faulty air struts, compressor, or air lines. Properly diagnose the source of the leak before replacing components.
  • Estimated Cost to Fix: $500 - $2000+ per component, depending on the brand and complexity.
  • Recalls: None Found
• Ball Joint and Control Arm Wear
  • Description/Symptoms: Due to the vehicle’s weight and age, ball joints and control arm bushings can wear out. Symptoms include clunking noises from the suspension, uneven tire wear, and loose steering.
  • Solution: Replace worn ball joints and control arms.
  • Estimated Cost to Fix: $300 - $1000+ per corner, depending on parts and labor.
  • Recalls: None Found

Electrical

• Instrument Cluster Pixelation
  • Description/Symptoms: The LCD screen in the instrument cluster is prone to pixelation, making it difficult to read information.
  • Solution: Replace the LCD screen or the entire instrument cluster. Some repair services specialize in fixing pixelation issues.
  • Estimated Cost to Fix: $200 - $800+ depending on the repair method.
  • Recalls: None Found
• Window Regulator Failure
  • Description/Symptoms: The window regulators can fail, causing the windows to move slowly, erratically, or not at all.
  • Solution: Replace the faulty window regulator.
  • Estimated Cost to Fix: $200 - $500 per window.
  • Recalls: None Found

Exterior

• Rust
  • Description/Symptoms: Rust can develop, especially in areas prone to road salt exposure. Common areas include the rocker panels, wheel arches, and undercarriage.
  • Solution: Repair or replace rusted panels. Applying rust inhibitors can help prevent future rust.
  • Estimated Cost to Fix: Highly variable, depending on the extent of the rust. Can range from a few hundred dollars for minor repairs to several thousand for extensive rust repair.
  • Recalls: None Found

Interior

• Sunroof Issues
  • Description/Symptoms: Sunroofs are known for malfunctioning, often due to broken plastic components in the mechanism or a clogged drain tube.
  • Solution: Repair or replace the sunroof mechanism. Cleaning the drain tubes can prevent future issues.
  • Estimated Cost to Fix: $200 - $1000+ depending on the complexity of the repair.
  • Recalls: None Found

Summary The 2002 Mercedes-Benz ML55 AMG, while desirable for its performance and luxury, is prone to several age-related issues. Engine and transmission problems such as oil leaks and valve body issues in the transmission are common, and repairs can be moderately expensive. Electrical issues like pixelation of the instrument cluster and window regulator failure also appear frequently. Suspension components, especially those related to air suspension if equipped, are prone to wear and tear. Addressing these issues promptly is crucial to maintaining the vehicle’s reliability and performance.