2021 Audi A4 Quattro

The 2021 Audi A4 Quattro is a popular luxury sedan known for its refined driving experience, stylish interior, and advanced technology. The standard engine is a 2.0-liter turbocharged inline-4, producing 201 horsepower and 236 lb-ft of torque in the 40 TFSI configuration or 261 horsepower and 273 lb-ft of torque in the 45 TFSI configuration. Both engines are paired with a 7-speed S tronic dual-clutch automatic transmission and standard Quattro all-wheel drive. Some owners praise the A4 for its comfortable ride, responsive handling, and user-friendly infotainment system. Common dislikes include the relatively small rear seats and the potential for costly repairs due to the complexity of the vehicle’s systems.

Engine

2.0L Turbocharged Inline-4 (40 TFSI)

• No Issues Found

2.0L Turbocharged Inline-4 (45 TFSI)

• Excessive Oil Consumption (Potential)
  • Description/Symptoms: Some owners have reported higher than expected oil consumption, requiring more frequent oil top-offs between scheduled services. This can be a gradual increase or a sudden onset.
  • Solution: Monitor oil levels regularly. If consumption is excessive (more than 1 quart per 1,000 miles), consult with an Audi service center. Potential fixes range from software updates to piston ring replacement, depending on the severity and root cause.
  • Estimated Cost to Fix: Varies greatly; $0 (if software update is the fix) to $5,000+ (for major engine work).
  • Recalls: None Found

Transmission

7-Speed S tronic Dual-Clutch Automatic

• Mechatronic Unit Failure (Potential)
  • Description/Symptoms: Some owners have reported issues with the Mechatronic unit (the transmission’s control module), resulting in harsh shifting, delayed engagement, or even complete loss of drive. Warning lights related to the transmission may also illuminate.
  • Solution: Diagnostic scan to confirm Mechatronic unit failure. Replacement or reprogramming of the Mechatronic unit is typically required.
  • Estimated Cost to Fix: $2,000 - $4,000+
  • Recalls: None Found

Suspension

• No Issues Found

Electrical

• Infotainment System Glitches
  • Description/Symptoms: The MMI infotainment system can experience glitches such as freezing, slow response times, or spontaneous reboots. Apple CarPlay or Android Auto connectivity issues are also sometimes reported.
  • Solution: Try a system reset. If the problem persists, software updates or, in rare cases, hardware replacement may be needed.
  • Estimated Cost to Fix: $0 (for software updates) to $1,500+ (for hardware replacement).
  • Recalls: None Found
• Sensor Malfunctions
  • Description/Symptoms: Faulty sensors, particularly those related to the driver assistance systems (e.g., parking sensors, blind-spot monitoring), can trigger warning lights and disable features.
  • Solution: Diagnostic scan to identify the faulty sensor. Replacement of the sensor is usually the required fix.
  • Estimated Cost to Fix: $200 - $800+ per sensor, depending on the sensor type and location.
  • Recalls: None Found

Exterior

• No Issues Found

Interior

• Sunroof Rattle/Creaking
  • Description/Symptoms: Some owners have reported rattling or creaking noises emanating from the sunroof area, especially when driving over uneven surfaces.
  • Solution: Inspection and lubrication of the sunroof seals and components. Adjustments to the sunroof mechanism may also be necessary.
  • Estimated Cost to Fix: $100 - $500+
  • Recalls: None Found

Summary

The 2021 Audi A4 Quattro is a generally reliable vehicle, but some potential issues have been reported. The most concerning are the potential for excessive oil consumption in the 45 TFSI engine and Mechatronic unit failure in the transmission, as these can lead to significant repair costs. Electrical glitches and sunroof noises are less severe but can still be frustrating. Potential buyers should be aware of these common issues and have a qualified mechanic inspect the vehicle before purchase.