2011 Audi S4

The 2011 Audi S4 is a performance-oriented sedan that offers a blend of luxury and sporty driving dynamics. The standard and most common engine option is a supercharged 3.0-liter V6, producing 333 horsepower and 325 lb-ft of torque. This engine was available with either a 6-speed manual transmission or a 7-speed S-tronic dual-clutch transmission. Owners often praise the car’s quick acceleration, precise handling, and comfortable interior. However, some common complaints include higher-than-average maintenance costs, potential issues with the timing chain, and the dual-clutch transmission’s behavior at low speeds.

Engine

3.0L Supercharged V6

• Timing Chain Tensioner Failure
  • Description/Symptoms: A rattling noise upon cold start-up, especially from the rear of the engine. If left unresolved, it can lead to timing chain slippage and significant engine damage.
  • Solution: Replacing the timing chain tensioners, guides, and chains. It is recommended to replace all components in the timing system, including the water pump as it can affect the timing system if the bearing fails.
  • Estimated Cost to Fix: $3,000 - $5,000+
  • Recalls: None Found
• Thermostat Housing Leak
  • Description/Symptoms: Coolant leak under the supercharger, often accompanied by a sweet smell and/or low coolant warning light.
  • Solution: Replacing the thermostat housing assembly, which often includes the thermostat itself.
  • Estimated Cost to Fix: $500 - $1000
  • Recalls: None Found
• PCV Valve Failure
  • Description/Symptoms: Rough idle, misfires, oil consumption, and potential vacuum leaks. Can also lead to boost leaks and poor performance.
  • Solution: Replacing the PCV valve assembly.
  • Estimated Cost to Fix: $300 - $600
  • Recalls: None Found
• Supercharger Issues
  • Description/Symptoms: Whining noise, loss of power, or supercharger failure. The supercharger clutch/pulley can fail.
  • Solution: Supercharger rebuild or replacement. Replacing just the clutch/pulley if that is the specific issue.
  • Estimated Cost to Fix: $1,500 - $4,000+
  • Recalls: None Found

Transmission

6-Speed Manual

• Clutch Failure
  • Description/Symptoms: Slipping clutch, difficulty shifting, or complete loss of clutch engagement.
  • Solution: Clutch replacement.
  • Estimated Cost to Fix: $1,500 - $2,500
  • Recalls: None Found

7-Speed S-Tronic (Dual-Clutch)

• Mechatronic Unit Failure
  • Description/Symptoms: Harsh shifting, delayed engagement, transmission slipping, or complete transmission failure.
  • Solution: Mechatronic unit replacement or repair.
  • Estimated Cost to Fix: $2,500 - $5,000+
  • Recalls: None Found
• Clutch Pack Failure
  • Description/Symptoms: Similar symptoms to the Mechatronic unit failure, including slipping, jerky shifts, and failure to engage.
  • Solution: Clutch pack replacement, and potentially Mechatronic unit repair or replacement.
  • Estimated Cost to Fix: $3,000 - $6,000+
  • Recalls: None Found

Suspension

• Control Arm Bushing Failure
  • Description/Symptoms: Clunking noises from the front suspension, especially when going over bumps. Poor handling and alignment issues.
  • Solution: Replacing the worn control arms with new bushings.
  • Estimated Cost to Fix: $500 - $1,500 (depending on which arms are replaced)
  • Recalls: None Found

Electrical

• Oxygen Sensor Failure
  • Description/Symptoms: Check engine light, poor fuel economy, rough idle, and potential catalytic converter damage.
  • Solution: Replacing the faulty oxygen sensor(s).
  • Estimated Cost to Fix: $200 - $500+ (depending on which sensor and if DIY or shop)
  • Recalls: None Found
• Faulty Wheel Speed Sensor
  • Description/Symptoms: ABS and/or traction control lights on the dashboard, potentially along with other warning lights. Can affect ABS and traction control functionality.
  • Solution: Replacing the faulty wheel speed sensor(s).
  • Estimated Cost to Fix: $200 - $400+
  • Recalls: None Found

Exterior

• Adaptive Headlight Failure
  • Description/Symptoms: One or both headlights not leveling or turning properly. Error message on the dashboard.
  • Solution: Replacing the headlight assembly or related components.
  • Estimated Cost to Fix: $800 - $2,000+ per headlight.
  • Recalls: None Found

Interior

• Navigation Screen Failure
  • Description/Symptoms: Blank screen, distorted display, or unresponsive touch controls.
  • Solution: Screen replacement or unit replacement.
  • Estimated Cost to Fix: $500 - $1,500+
  • Recalls: None Found

Summary

The 2011 Audi S4, while a desirable performance sedan, can suffer from a range of issues. The most concerning are the potential engine problems (timing chain, thermostat, and PCV) and transmission issues with the S-Tronic dual-clutch. Repairs for these can be quite costly. Suspension components and various electrical issues are also relatively common. Potential buyers should be aware of these potential expenses and thoroughly inspect the vehicle before purchasing, paying close attention to service records and addressing any unusual noises or symptoms. While issues are not abundant, the severity and cost can be quite high.