2008 Audi S4

The 2008 Audi S4 is a performance-oriented sedan known for its blend of luxury and sportiness. It came standard with a 4.2-liter V8 engine producing 340 horsepower and 302 lb-ft of torque. All models were equipped with Audi’s Quattro all-wheel-drive system. Transmission options included a 6-speed manual and a 6-speed Tiptronic automatic. Owners appreciate the S4’s powerful engine, sporty handling, and luxurious interior. Common complaints often revolve around the car’s age, leading to increased maintenance costs and potential reliability issues, particularly with the engine and electrical systems.

Engine

4.2L V8

• Timing Chain Tensioner Failure
  • Description/Symptoms: A rattling noise upon startup, especially when cold. This indicates wear or failure of the timing chain tensioners, which can lead to catastrophic engine damage if not addressed. This issue is more common in earlier versions of the 4.2L V8.
  • Solution: Replace the timing chain tensioners, guides, and chains. It is recommended to replace all related components as a preventative measure.
  • Estimated Cost to Fix: $4,000 - $8,000+
  • Recalls: None Found
• Carbon Buildup
  • Description/Symptoms: Rough idle, decreased power, poor fuel economy, and potential misfires. Direct injection engines, like the 4.2L V8, are prone to carbon buildup on the intake valves.
  • Solution: Manual cleaning of the intake valves (walnut blasting) or chemical cleaning.
  • Estimated Cost to Fix: $800 - $1,500
  • Recalls: None Found
• Oil Leaks
  • Description/Symptoms: Oil spots under the car, burning oil smell, and low oil level warnings. Common leak locations include valve cover gaskets, rear main seal, and oil cooler.
  • Solution: Replace the leaking gaskets or seals.
  • Estimated Cost to Fix: $200 - $1,000+ (depending on location and severity)
  • Recalls: None Found

Transmission

6-Speed Manual

• Clutch Failure
  • Description/Symptoms: Clutch slippage, difficulty shifting, and unusual noises when engaging or disengaging the clutch.
  • Solution: Replace the clutch disc, pressure plate, and throwout bearing. Consider replacing the flywheel as well.
  • Estimated Cost to Fix: $1,500 - $3,000
  • Recalls: None Found

6-Speed Tiptronic Automatic

• Valve Body Issues
  • Description/Symptoms: Harsh shifting, delayed engagement, slipping between gears, and potential limp mode.
  • Solution: Replace or rebuild the valve body. Some owners opt for aftermarket valve bodies with improved performance.
  • Estimated Cost to Fix: $1,500 - $3,500
  • Recalls: None Found

Suspension

• Control Arm Bushing Failure
  • Description/Symptoms: Clunking noises from the front suspension, especially over bumps. Vague steering and uneven tire wear.
  • Solution: Replace the worn control arm bushings or the entire control arm.
  • Estimated Cost to Fix: $300 - $1,000+ (depending on the number of arms replaced and labor)
  • Recalls: None Found
• Damper Failure
  • Description/Symptoms: Bouncy ride, poor handling, and potential fluid leaks from the dampers.
  • Solution: Replace the dampers. It is recommended to replace them in pairs (front or rear).
  • Estimated Cost to Fix: $600 - $2,000+ (depending on brand and labor)
  • Recalls: None Found

Electrical

• Radio/Navigation System Failure
  • Description/Symptoms: Intermittent or complete failure of the radio, navigation system, or Multi Media Interface (MMI) screen.
  • Solution: Diagnose the cause of the failure. This could be a faulty module, wiring issue, or software glitch. Repair or replace the affected component.
  • Estimated Cost to Fix: $200 - $2,000+ (depending on the component needing replacement)
  • Recalls: None Found
• Instrument Cluster Pixel Failure
  • Description/Symptoms: Missing or faded pixels in the instrument cluster display, making it difficult to read information.
  • Solution: Replace the instrument cluster or have the display repaired by a specialized electronics repair shop.
  • Estimated Cost to Fix: $300 - $1,000+
  • Recalls: None Found
• Door Lock Actuator Failure
  • Description/Symptoms: Door does not lock or unlock with the remote or interior switch.
  • Solution: Replace the faulty door lock actuator.
  • Estimated Cost to Fix: $200 - $500
  • Recalls: None Found

Exterior

• Fog Light Condensation/Cracking
  • Description/Symptoms: Condensation inside the fog lights or cracking of the lens.
  • Solution: Replace the fog lights.
  • Estimated Cost to Fix: $100 - $300
  • Recalls: None Found

Interior

• Sunroof Issues
  • Description/Symptoms: Sunroof not opening or closing properly, getting stuck, or making excessive noise.
  • Solution: Inspect and lubricate the sunroof tracks and mechanism. Repair or replace any broken components.
  • Estimated Cost to Fix: $100 - $800
  • Recalls: None Found
• Glove Box Latch Failure
  • Description/Symptoms: Glove box latch breaks, preventing the glove box from closing properly.
  • Solution: Replace the glove box latch.
  • Estimated Cost to Fix: $50 - $200
  • Recalls: None Found

Summary

The 2008 Audi S4, while a desirable performance sedan, is prone to certain issues due to its age and the complexity of its systems. Engine problems, particularly timing chain issues and carbon buildup, are among the most concerning and potentially expensive. Suspension and electrical issues are also common. Overall, prospective buyers should be aware of these potential problems and factor in maintenance and repair costs when considering purchasing this vehicle. The severity of the issues ranges from minor inconveniences to major repairs, with costs ranging from a few hundred dollars to several thousand.