2005 Audi S4

The 2005 Audi S4 is a performance sedan/wagon/convertible that was part of the B6 generation. It’s known for its potent V8 engine, Quattro all-wheel-drive system, and sporty handling. The 2005 S4 came standard with a 4.2-liter V8 engine producing 340 horsepower and 302 lb-ft of torque. Transmission options included a 6-speed manual and a 6-speed Tiptronic automatic. Owners appreciate the S4 for its engaging driving experience, luxurious interior, and distinctive styling. However, common complaints revolve around high maintenance costs, potential for significant repairs, and the car’s age, which can lead to various component failures.

Engine

4.2L V8

• Timing Chain Tensioner Failure
  • Description/Symptoms: The timing chain tensioners on the 4.2L V8 can wear down and fail, leading to timing chain rattle, especially on startup. If left unaddressed, this can cause catastrophic engine damage due to timing misalignment.
  • Solution: Replace the timing chain tensioners, guides, and chains.
  • Estimated Cost to Fix: $5,000 - $8,000+
  • Recalls: None Found
• Carbon Buildup
  • Description/Symptoms: Direct injection engines like the 4.2L V8 are prone to carbon buildup on the intake valves, reducing airflow and performance. Symptoms include rough idling, misfires, and decreased fuel economy.
  • Solution: Perform a carbon cleaning service, such as walnut blasting, to remove the carbon deposits.
  • Estimated Cost to Fix: $800 - $1,500+
  • Recalls: None Found
• Coolant Leaks
  • Description/Symptoms: Coolant leaks can occur from various locations, including the coolant reservoir, hoses, water pump, or the auxiliary coolant pump. Leaks can lead to overheating and potential engine damage.
  • Solution: Identify and replace the faulty component.
  • Estimated Cost to Fix: $200 - $1,000+ depending on the location and component.
  • Recalls: None Found
• Oil Leaks
  • Description/Symptoms: Oil leaks are common in older 4.2L V8 engines. Potential leak locations include valve cover gaskets, rear main seal, and oil cooler lines. Leaks can cause oil consumption and potential engine damage if oil levels drop too low.
  • Solution: Replace the leaking gaskets or seals.
  • Estimated Cost to Fix: $300 - $1,500+ depending on the location and severity.
  • Recalls: None Found

Transmission

6-Speed Manual

• Clutch Failure
  • Description/Symptoms: Clutch wear and failure are common, especially in performance vehicles like the S4. Symptoms include slipping clutch, difficulty shifting, and a high clutch engagement point.
  • Solution: Replace the clutch disc, pressure plate, and throw-out bearing.
  • Estimated Cost to Fix: $1,000 - $2,000+
  • Recalls: None Found
• Synchro Wear
  • Description/Symptoms: Synchros in the 6-speed manual transmission can wear over time, leading to difficulty shifting into certain gears, especially when cold. Grinding noises may also be present.
  • Solution: Rebuild or replace the transmission.
  • Estimated Cost to Fix: $2,000 - $5,000+
  • Recalls: None Found

6-Speed Tiptronic Automatic

• Valve Body Issues
  • Description/Symptoms: The valve body in the 6-speed Tiptronic automatic transmission can experience wear and failure, resulting in erratic shifting, slipping, and delayed engagement.
  • Solution: Replace or rebuild the valve body. In some cases, a full transmission rebuild may be necessary.
  • Estimated Cost to Fix: $800 - $4,000+
  • Recalls: None Found

Suspension

• Control Arm Bushing Failure
  • Description/Symptoms: The control arm bushings, particularly in the front suspension, are prone to wear and failure. Symptoms include clunking noises, vibrations, and poor handling.
  • Solution: Replace the control arms or the bushings. Replacing the entire control arm is typically recommended.
  • Estimated Cost to Fix: $500 - $1,500+ per axle
  • Recalls: None Found
• Damper Failure
  • Description/Symptoms: The dampers can leak or wear, reducing ride quality and handling.
  • Solution: Replace the front or rear dampers.
  • Estimated Cost to Fix: $400 - $1,000+ per axle
  • Recalls: None Found

Electrical

• Instrument Cluster Pixel Failure
  • Description/Symptoms: Pixels in the instrument cluster display can fail, making it difficult to read important information.
  • Solution: Replace or repair the instrument cluster.
  • Estimated Cost to Fix: $300 - $800+
  • Recalls: None Found
• Door Lock Actuator Failure
  • Description/Symptoms: Door lock actuators can fail, causing doors to not lock or unlock properly.
  • Solution: Replace the faulty door lock actuator.
  • Estimated Cost to Fix: $200 - $400+ per door
  • Recalls: None Found
• Window Regulator Failure
  • Description/Symptoms: Window regulators can fail, causing the windows to not go up or down.
  • Solution: Replace the faulty window regulator.
  • Estimated Cost to Fix: $200 - $400+ per door
  • Recalls: None Found

Exterior

• Door Handles Breaking
  • Description/Symptoms: The exterior door handles can break, especially in cold weather.
  • Solution: Replace the faulty door handle.
  • Estimated Cost to Fix: $150 - $300+ per door
  • Recalls: None Found

Interior

• Navigation System Failure
  • Description/Symptoms: The navigation system (if equipped) can experience software glitches or hardware failures, resulting in a non-functional system.
  • Solution: Repair or replace the navigation unit.
  • Estimated Cost to Fix: $300 - $1,000+
  • Recalls: None Found

Summary

The 2005 Audi S4, while a desirable performance vehicle, is prone to a number of issues due to its age and complex mechanical components. Engine-related problems, particularly timing chain tensioner failure and carbon buildup, are among the most serious and costly to repair. Transmission issues, both manual and automatic, are also common. Suspension and electrical problems can further add to the ownership costs. Overall, owning a 2005 Audi S4 requires a proactive approach to maintenance and the expectation of potentially significant repair expenses.