2004 Audi S4

The 2004 Audi S4 is a performance sedan known for its blend of luxury and sportiness. It boasts a 4.2L V8 engine producing 340 horsepower and 302 lb-ft of torque. The engine was paired with either a 6-speed manual or a 6-speed automatic transmission (Tiptronic). Owners often appreciate the S4’s distinctive styling, potent engine, and quattro all-wheel-drive system. However, common complaints include higher-than-average maintenance costs and the age-related issues inherent in a vehicle of this vintage.

Engine

4.2L V8

• Timing Chain Tensioner Failure
  • Description/Symptoms: A rattling noise upon cold start, especially from the rear of the engine. This indicates wear or failure of the timing chain tensioners. If left unresolved, it can lead to catastrophic engine damage due to timing misalignment.
  • Solution: Replacement of the timing chain tensioners, guides, and potentially the chains themselves. Requires significant engine disassembly.
  • Estimated Cost to Fix: $3,000 - $6,000+
  • Recalls: None Found
• Oil Leaks
  • Description/Symptoms: Oil spots on the ground beneath the engine, burning oil smell, and low oil level warnings. Common leak locations include valve cover gaskets, rear main seal, and oil cooler seals.
  • Solution: Replacement of the leaking gaskets and seals. May require engine removal for rear main seal replacement.
  • Estimated Cost to Fix: $200 - $2000+ depending on the location and severity of the leak.
  • Recalls: None Found
• Coolant Leaks
  • Description/Symptoms: Coolant leaks around the engine, engine overheating. Common leak locations include the coolant reservoir, hoses, and water pump.
  • Solution: Replacement of the leaking components.
  • Estimated Cost to Fix: $100 - $1000+, depending on the location and component.
  • Recalls: None Found

Transmission

6-Speed Manual

• Clutch Failure
  • Description/Symptoms: Clutch slippage, difficulty shifting gears, high clutch pedal engagement point, or a burning smell.
  • Solution: Replacement of the clutch disc, pressure plate, and throw-out bearing. Flywheel resurfacing or replacement is often recommended.
  • Estimated Cost to Fix: $1,200 - $2,500
  • Recalls: None Found

6-Speed Tiptronic Automatic

• Valve Body Issues
  • Description/Symptoms: Harsh or delayed shifting, slipping between gears, or complete transmission failure. Often caused by wear and tear in the valve body.
  • Solution: Replacement or rebuilding of the valve body. In severe cases, a complete transmission rebuild or replacement may be necessary.
  • Estimated Cost to Fix: $800 - $4,000+
  • Recalls: None Found

Suspension

• Control Arm Bushing Failure
  • Description/Symptoms: Clunking noises from the suspension, uneven tire wear, and vague steering feel. The front control arm bushings are particularly prone to wear.
  • Solution: Replacement of the control arm bushings or the entire control arm assembly.
  • Estimated Cost to Fix: $200 - $1,000+ per corner
  • Recalls: None Found
• Damper Failure
  • Description/Symptoms: Bouncy ride, poor handling, leaks from struts/shocks.
  • Solution: Replacement of the shocks and struts.
  • Estimated Cost to Fix: $500 - $2,000+, depending on brand and labor.
  • Recalls: None Found

Electrical

• Instrument Cluster Pixelation
  • Description/Symptoms: Pixels disappearing or fading on the instrument cluster display, making it difficult to read information.
  • Solution: Replacement or repair of the instrument cluster.
  • Estimated Cost to Fix: $300 - $1,000
  • Recalls: None Found
• Oxygen Sensor Failure
  • Description/Symptoms: Check engine light illumination, poor fuel economy, and rough engine running.
  • Solution: Replacement of the faulty oxygen sensor(s).
  • Estimated Cost to Fix: $150 - $500+ per sensor.
  • Recalls: None Found

Exterior

• Door Handle Issues
  • Description/Symptoms: Broken or loose door handles, difficulty opening doors.
  • Solution: Replacement of the door handle.
  • Estimated Cost to Fix: $100 - $400 per handle.
  • Recalls: None Found

Interior

• Sunroof Issues
  • Description/Symptoms: Sunroof not opening or closing correctly, getting stuck, or leaking.
  • Solution: Repair or replacement of the sunroof motor, tracks, or seals.
  • Estimated Cost to Fix: $200 - $1,000+
  • Recalls: None Found

Summary

The 2004 Audi S4, while a desirable performance vehicle, is prone to a number of age-related issues. The most significant concerns revolve around the engine, particularly the timing chain tensioners, which can lead to expensive repairs if neglected. Oil and coolant leaks are also common. Suspension components like control arm bushings also tend to wear out over time. While some electrical and interior issues may arise, they are generally less costly than major engine or transmission repairs. Potential buyers should be prepared for potentially high maintenance costs associated with this vehicle.