2004 Audi RS6

The 2004 Audi RS6 is a high-performance sedan that boasts a 4.2-liter twin-turbocharged V8 engine producing 450 horsepower and 415 lb-ft of torque. It was only offered with a 5-speed automatic transmission. Owners appreciate its powerful engine, comfortable ride, and understated styling. However, it’s also known for its complex systems, which can lead to costly repairs. Common dislikes include high maintenance costs and potential reliability issues.

Engine

4.2L Twin-Turbo V8

• Oil Leaks from Valve Cover Gaskets
  • Description/Symptoms: Oil leaks are common due to the age and heat cycling of the gaskets. Symptoms include oil drips under the car, burning oil smell, and visible oil accumulation around the valve covers.
  • Solution: Replacement of the valve cover gaskets.
  • Estimated Cost to Fix: $400 - $800+
  • Recalls: None Found
• Turbocharger Failure
  • Description/Symptoms: The RS6’s twin turbos are susceptible to failure due to age, wear, and potential oil starvation. Symptoms include reduced power, whistling noises from the engine bay, and potentially check engine lights.
  • Solution: Replacement or rebuilding of the turbochargers.
  • Estimated Cost to Fix: $3,000 - $6,000+
  • Recalls: None Found
• Coolant Leaks (After-Run Coolant Pump)
  • Description/Symptoms: The after-run coolant pump, designed to cool the turbos after the engine is shut off, can fail and cause coolant leaks.
  • Solution: Replacement of the after-run coolant pump.
  • Estimated Cost to Fix: $200 - $400+
  • Recalls: None Found
• Coolant Leaks (Coolant Pipes/Hoses)
  • Description/Symptoms: The engine bay has many coolant pipes and hoses that can become brittle over time and leak. Symptoms include coolant loss, overheating, and visible leaks.
  • Solution: Replacement of the affected pipes/hoses.
  • Estimated Cost to Fix: $100 - $500+, depending on the location and severity of the leak.
  • Recalls: None Found

Transmission

5-Speed Automatic (ZF 5HP24A)

• Torque Converter Failure
  • Description/Symptoms: The torque converter can fail over time, leading to slipping, shuddering, or complete loss of drive.
  • Solution: Replacement of the torque converter or complete transmission rebuild/replacement.
  • Estimated Cost to Fix: $1,500 - $5,000+
  • Recalls: None Found
• Valve Body Issues
  • Description/Symptoms: The valve body in the transmission can wear out, causing rough shifting, delayed engagement, and slipping.
  • Solution: Valve body rebuild or replacement.
  • Estimated Cost to Fix: $800 - $2,500+
  • Recalls: None Found

Suspension

• Dynamic Ride Control (DRC) Failure
  • Description/Symptoms: The DRC system, which provides a balance between comfort and handling, is prone to leaks and failures. Symptoms include uneven ride height, bouncy ride, and fluid leaks from the dampers.
  • Solution: Replacement of the DRC dampers and accumulators. Some owners opt to replace the DRC system with a traditional coilover suspension setup.
  • Estimated Cost to Fix: DRC repair $2,000 - $5,000+. Coilover conversion $1,500-$4,000+
  • Recalls: None Found

Electrical

• Instrument Cluster Pixel Failure
  • Description/Symptoms: Common issue where pixels in the instrument cluster screen start to fail, making it difficult to read information.
  • Solution: Repair or replacement of the instrument cluster.
  • Estimated Cost to Fix: $300 - $1,000+
  • Recalls: None Found
• ABS Module Failure
  • Description/Symptoms: The ABS module can fail, leading to warning lights on the dashboard and potentially affecting braking performance.
  • Solution: Repair or replacement of the ABS module.
  • Estimated Cost to Fix: $500 - $1,500+
  • Recalls: None Found

Exterior

• Headlight Condensation
  • Description/Symptoms: Moisture can accumulate inside the headlight housings, leading to condensation and potentially damaging the bulbs or wiring.
  • Solution: Removal and resealing of the headlight housings.
  • Estimated Cost to Fix: $200 - $500+
  • Recalls: None Found

Interior

• Navigation System Failure
  • Description/Symptoms: The factory navigation system can become outdated or fail completely.
  • Solution: Replacement with an aftermarket unit or repair of the original system.
  • Estimated Cost to Fix: $200 - $1,000+ for repairs. Aftermarket solutions vary widely.
  • Recalls: None Found

Summary

The 2004 Audi RS6 is a performance vehicle that requires careful maintenance and can be expensive to repair. Many of the common issues stem from the age of the vehicle and the complexity of its systems. Engine and transmission repairs, particularly related to the turbos and DRC, can be quite costly. Prospective buyers should be aware of these potential issues and factor them into their purchasing decision.