2021 Audi A4

Here’s a comprehensive breakdown of common issues and complaints for the 2021 Audi A4, categorized by major components and engine/transmission options.

The 2021 Audi A4 is a popular luxury sedan known for its stylish design, refined interior, and engaging driving dynamics. It’s available with a turbocharged 2.0-liter four-cylinder engine in two different power outputs: 201 horsepower/236 lb-ft of torque (40 TFSI) and 261 horsepower/273 lb-ft of torque (45 TFSI). Both engines are paired with a 7-speed S tronic dual-clutch automatic transmission. Owners generally appreciate the A4’s comfortable ride, advanced technology features, and fuel efficiency. However, some common criticisms include the relatively small rear seat, occasional infotainment glitches, and the cost of maintenance and repairs.

Engine

2.0L Turbo (40 TFSI & 45 TFSI)

• Oil Leaks
  • Description/Symptoms: Oil leaks may appear around the valve cover gasket or the timing chain cover. These leaks can be minor initially but can worsen over time, leading to oil consumption and potential engine damage. Signs include visible oil accumulation on the engine and a burning oil smell.
  • Solution: Replacing the affected gasket or seal is the typical solution. In more severe cases, the entire valve cover or timing chain cover may need replacement.
  • Estimated Cost to Fix: $200 - $800+
  • Recalls: None Found
• Turbocharger Issues
  • Description/Symptoms: Some owners have reported premature turbocharger failure or issues with the wastegate actuator. Symptoms include reduced engine power, hesitation during acceleration, unusual turbocharger noises (whining or whistling), and potential error codes related to turbocharger performance.
  • Solution: Replacing the turbocharger or repairing the wastegate actuator is usually necessary.
  • Estimated Cost to Fix: $1500 - $3000+
  • Recalls: None Found

Transmission

7-Speed S tronic Dual-Clutch Automatic

• Rough Shifting
  • Description/Symptoms: Some owners experience rough or jerky shifting, particularly at low speeds or during downshifts. This can be more pronounced when the transmission is cold.
  • Solution: In some cases, a transmission software update can resolve the issue. In other cases, valve body replacement or clutch replacement may be required.
  • Estimated Cost to Fix: $200 (software update) - $3000+ (major repair)
  • Recalls: None Found
• Mechatronic Unit Failure
  • Description/Symptoms: The mechatronic unit controls the transmission’s shifting functions. Failure can lead to erratic shifting, limp mode, or complete loss of gear engagement.
  • Solution: Replacement of the mechatronic unit.
  • Estimated Cost to Fix: $2000 - $4000+
  • Recalls: None Found

Electrical

• Infotainment System Freezes/Glitches
  • Description/Symptoms: The infotainment system (MMI) may freeze, lag, or experience intermittent glitches. This can include issues with Bluetooth connectivity, navigation, or audio playback.
  • Solution: Software updates are often the first step in addressing these issues. In some cases, replacing the MMI control unit may be necessary.
  • Estimated Cost to Fix: $0 (software update) - $1000+ (MMI unit replacement)
  • Recalls: None Found
• Sensor Malfunctions
  • Description/Symptoms: Sensors, such as those for the parking system or driver assistance features, can malfunction, leading to incorrect alerts or disabled features.
  • Solution: Replacing the faulty sensor.
  • Estimated Cost to Fix: $200 - $800+
  • Recalls: None Found

Interior

• Sunroof Issues
  • Description/Symptoms: The sunroof may become stuck, make excessive noise during operation, or leak water.
  • Solution: Repair or replacement of the sunroof motor, tracks, or seals.
  • Estimated Cost to Fix: $300 - $1000+
  • Recalls: None Found

Exterior

• Headlight Malfunction
  • Description/Symptoms: LED headlights can experience premature failure or flickering.
  • Solution: Replacement of the headlight assembly.
  • Estimated Cost to Fix: $800 - $2000+ per headlight
  • Recalls: None Found

Suspension

No Issues Found

Summary

The 2021 Audi A4, while generally reliable, can experience some common issues. Engine oil leaks and turbocharger problems are potential concerns, particularly for higher-mileage examples. The S tronic transmission can exhibit rough shifting or mechatronic unit failures. Electrical glitches, especially with the infotainment system, are also reported. While some issues can be resolved with software updates or minor repairs, others can be quite costly, especially those involving the turbocharger, transmission, or headlight assemblies. Before purchasing a used 2021 A4, a thorough inspection by a qualified mechanic is recommended.