2021 BMW 840i xDrive

The 2021 BMW 840i xDrive is a luxury grand tourer known for its blend of performance, comfort, and style. The 840i xDrive comes standard with a 3.0-liter turbocharged inline-6 engine producing 335 horsepower and 369 lb-ft of torque paired with an 8-speed automatic transmission. Other engine options include a 4.4-liter twin-turbo V8 in the M850i xDrive and the high-performance M8. Drivers often praise the 840i xDrive for its smooth ride, powerful engine, elegant interior, and advanced technology. Common criticisms include its high price, complex infotainment system, and limited rear seat space.

Engine

3.0L Turbocharged Inline-6 (B58)

• Oil Leaks from Oil Filter Housing/Valve Cover
  • Description/Symptoms: Oil leaks can occur from the oil filter housing gasket or the valve cover gasket. Symptoms include visible oil leaks under the car, a burning oil smell, and low oil levels.
  • Solution: Replacement of the oil filter housing gasket or valve cover gasket is required.
  • Estimated Cost to Fix: $300 - $700+
  • Recalls: None Found
• Coolant Leaks
  • Description/Symptoms: Coolant leaks can occur from the radiator, hoses, or expansion tank. Symptoms include low coolant levels, overheating, and visible coolant leaks.
  • Solution: Replacement of the leaking component.
  • Estimated Cost to Fix: $200 - $1000+
  • Recalls: None Found

Transmission

8-Speed Automatic (ZF 8HP)

• Rough or Delayed Shifting
  • Description/Symptoms: Some owners have reported experiencing rough or delayed shifts, particularly during acceleration or deceleration. This can sometimes be attributed to the transmission’s adaptive learning.
  • Solution: A software update for the transmission control unit (TCU) or a transmission fluid flush may resolve the issue. In severe cases, transmission replacement may be required.
  • Estimated Cost to Fix: $200 - $8,000+
  • Recalls: None Found

Suspension

• Adaptive Damper Malfunctions
  • Description/Symptoms: The adaptive dampers can sometimes fail, leading to a noticeably rougher ride, error messages on the dashboard, or uneven handling.
  • Solution: Replacement of the faulty damper.
  • Estimated Cost to Fix: $500 - $1500 per damper
  • Recalls: None Found

Electrical

• iDrive System Freezing/Crashing
  • Description/Symptoms: The iDrive infotainment system can occasionally freeze, crash, or become unresponsive. This can affect navigation, audio, and other vehicle functions.
  • Solution: A software update can sometimes resolve the issue. In other cases, the iDrive module may need to be replaced.
  • Estimated Cost to Fix: $100 - $1,500+
  • Recalls: None Found
• Sensor Failures (Parking Sensors, Driver Assistance Systems)
  • Description/Symptoms: Failures of parking sensors or other driver assistance sensors (e.g., blind spot monitoring, lane departure warning) can occur, leading to error messages and a loss of functionality.
  • Solution: Replacement of the faulty sensor.
  • Estimated Cost to Fix: $200 - $800+
  • Recalls: None Found

Exterior

• No Issues Found

Interior

• Creaking/Rattling Noises
  • Description/Symptoms: Some owners have reported experiencing creaking or rattling noises emanating from the dashboard, door panels, or other interior trim pieces.
  • Solution: Identifying and tightening or lubricating the source of the noise.
  • Estimated Cost to Fix: $100 - $500+
  • Recalls: None Found

Summary

The 2021 BMW 840i xDrive, while a well-regarded vehicle, can experience some common issues. Engine oil and coolant leaks are noted, as well as transmission issues like rough shifting. Electrical problems, particularly related to the iDrive system and sensor failures, are also relatively frequent. Finally, minor interior creaking or rattling noises are reported. The severity and cost of these issues vary, with some requiring simple fixes while others can be more expensive and time-consuming to address. Prospective buyers should be aware of these potential problems and have the vehicle thoroughly inspected before purchase.