2024 BMW M340i xDrive

The 2024 BMW M340i xDrive is a popular sports sedan praised for its blend of performance and luxury. It features a turbocharged 3.0-liter inline-six engine producing 382 horsepower and 369 lb-ft of torque. The M340i exclusively uses an 8-speed automatic transmission. While other 3 Series models offer different engine and drivetrain configurations (such as the 330i with a 2.0-liter turbocharged four-cylinder), the M340i xDrive stands out for its performance focus. People generally appreciate its strong acceleration, agile handling, and premium interior, but some criticisms include a somewhat firm ride and limited rear headroom.

Engine

3.0L Turbocharged Inline-Six (B58)

• Rough Idle/Cold Start Issues
  • Description/Symptoms: Some owners have reported experiencing rough idling or difficulty starting the engine when cold. This is mostly occurring with 2023+ B58 engines with the 48V mild hybrid system.
  • Solution: Dealership inspection and potential software update or replacement of the fuel injectors or high-pressure fuel pump.
  • Estimated Cost to Fix: $500 - $2000+
  • Recalls: None Found
• Oil Leaks
  • Description/Symptoms: Oil leaks have been reported, particularly around the valve cover gasket and oil filter housing. Visible oil drips or a burning smell may be present.
  • Solution: Replacement of the affected gasket or housing.
  • Estimated Cost to Fix: $200 - $800+
  • Recalls: None Found

Transmission

8-Speed Automatic (ZF 8HP)

• Harsh Shifting/Hesitation
  • Description/Symptoms: Some owners have reported experiencing harsh or jerky shifts, particularly during low-speed driving, or hesitation when accelerating. This is a common issue with the ZF 8HP.
  • Solution: Software reflash by the dealer or valve body replacement.
  • Estimated Cost to Fix: $100 - $1000+
  • Recalls: None Found

Suspension

• Adaptive M Suspension Malfunctions
  • Description/Symptoms: Reports of error messages related to the adaptive M suspension, leading to a loss of ride quality and handling performance.
  • Solution: Diagnosis by a BMW technician and potential replacement of the affected strut, sensor, or control module.
  • Estimated Cost to Fix: $500 - $2000+
  • Recalls: None Found

Electrical

• iDrive System Glitches
  • Description/Symptoms: Occasional freezing, lagging, or unexpected restarts of the iDrive infotainment system.
  • Solution: Software update from the dealership or, in rare cases, replacement of the iDrive module.
  • Estimated Cost to Fix: $0 (Software Update) - $1500+ (Module Replacement)
  • Recalls: None Found
• Sensor Failures (Parking Sensors, Blind Spot Monitoring)
  • Description/Symptoms: Malfunctioning parking sensors or blind-spot monitoring systems, resulting in false alarms or non-functionality.
  • Solution: Diagnosis and replacement of the faulty sensor.
  • Estimated Cost to Fix: $200 - $600+ per sensor.
  • Recalls: None Found

Interior

• Dashboard Rattles
  • Description/Symptoms: Rattling noises emanating from the dashboard, particularly when driving on rough roads.
  • Solution: Dealership inspection and tightening or replacement of the affected components.
  • Estimated Cost to Fix: $100 - $500+
  • Recalls: None Found
• Seat Squeaks
  • Description/Symptoms: Squeaking noises coming from the seats. Usually occurs when someone is seated and the car is in motion.
  • Solution: Dealership inspection to determine the source of the squeak, and re-lubrication/tightening of the components.
  • Estimated Cost to Fix: $100 - $500+
  • Recalls: None Found

Exterior

• No Issues Found

Summary:

The 2024 BMW M340i xDrive is a well-regarded performance sedan, but like any vehicle, it has its share of potential issues. The most frequently reported problems involve the engine’s rough idle/cold start, the transmission’s harsh shifting, glitches in the iDrive system, and potential oil leaks. While some of these issues may be minor annoyances, others could lead to more significant repair costs. Potential buyers should be aware of these potential problems and consider a pre-purchase inspection to assess the vehicle’s condition. Overall, the issues appear to be of moderate severity, with repair costs ranging from a few hundred dollars to potentially several thousand depending on the problem.