2015 BMW 750Li

The 2015 BMW 750Li is a luxury sedan known for its powerful engine, opulent interior, and advanced technology. The 750Li specifically houses a 4.4-liter TwinPower Turbo V8 engine, producing 445 horsepower and 480 lb-ft of torque. Other engine options for the 2015 7 Series include a 3.0-liter inline-6 turbo in the 740Li and a 6.0-liter V12 in the 760Li. All engines are paired with an 8-speed automatic transmission. Owners often praise the 750Li for its smooth ride, spacious cabin, and impressive performance. However, common complaints include high maintenance costs, complex electronics, and potential for various mechanical issues.

Engine

4.4L TwinPower Turbo V8 (N63TU)

• Oil Leaks
  • Description/Symptoms: Oil leaks are a common issue, often originating from valve cover gaskets, oil filter housing gasket, or turbocharger oil lines. Symptoms include visible oil leaks, burning oil smell, and low oil level warnings.
  • Solution: Replace the faulty gaskets or lines. Thoroughly clean the engine bay to identify the source of future leaks.
  • Estimated Cost to Fix: $400 - $1500+ depending on the leak location.
  • Recalls: None Found
• Coolant Leaks
  • Description/Symptoms: Coolant leaks can occur from various points, including the coolant expansion tank, hoses, and water pump. Symptoms include low coolant level, overheating, and visible coolant leaks.
  • Solution: Replace the faulty component and ensure the cooling system is properly bled.
  • Estimated Cost to Fix: $200 - $1000+ depending on the component.
  • Recalls: None Found
• Turbocharger Issues
  • Description/Symptoms: The turbochargers can develop issues like wastegate failure or oil leaks. Symptoms include reduced power, whistling noise, and potential engine damage if left unresolved.
  • Solution: Replace or rebuild the faulty turbocharger. Address any oil supply issues.
  • Estimated Cost to Fix: $2000 - $5000+ per turbo.
  • Recalls: None Found

Transmission

8-Speed Automatic (ZF 8HP)

• Rough Shifting
  • Description/Symptoms: Some owners report rough or hesitant shifting, especially between certain gears. This can be more pronounced when the transmission is cold.
  • Solution: A transmission fluid flush and filter change may resolve the issue. In more severe cases, valve body repair or replacement may be necessary.
  • Estimated Cost to Fix: $300 - $3000+ depending on the severity.
  • Recalls: None Found
• Mechatronic Unit Failure
  • Description/Symptoms: The mechatronic unit, which controls the transmission’s shifting, can fail. Symptoms include erratic shifting, limp mode, and transmission failure codes.
  • Solution: Replace or rebuild the mechatronic unit. Ensure the transmission fluid is clean and at the correct level.
  • Estimated Cost to Fix: $1500 - $4000+.
  • Recalls: None Found

Suspension

• Air Suspension Failure
  • Description/Symptoms: The air suspension system can experience failures in the air struts, air compressor, or valve block. Symptoms include sagging suspension, uneven ride height, and error messages.
  • Solution: Replace the faulty component. Ensure the air lines are properly sealed.
  • Estimated Cost to Fix: $1000 - $3000+ per strut, or $500 - $1500+ for compressor/valve block.
  • Recalls: None Found

Electrical

• iDrive System Issues
  • Description/Symptoms: The iDrive infotainment system can experience glitches, freezing, or complete failure. This can affect navigation, audio, and climate control.
  • Solution: Software updates may resolve some issues. In other cases, the iDrive control unit may need to be replaced.
  • Estimated Cost to Fix: $200 - $2000+ depending on the issue.
  • Recalls: None Found
• Battery Drain
  • Description/Symptoms: Excessive battery drain can occur, leading to a dead battery and difficulty starting the car. This can be caused by faulty modules or parasitic drain.
  • Solution: Diagnose and repair the source of the parasitic drain. Replace the battery if it is failing.
  • Estimated Cost to Fix: $100 - $1000+ depending on the source of the drain.
  • Recalls: None Found
• Sensor Malfunctions
  • Description/Symptoms: Various sensors, such as those for the park distance control (PDC) or tire pressure monitoring system (TPMS), can fail. Symptoms include error messages and malfunctioning systems.
  • Solution: Replace the faulty sensor.
  • Estimated Cost to Fix: $100 - $500+ per sensor.
  • Recalls: None Found

Exterior

• Adaptive Headlight Issues
  • Description/Symptoms: The adaptive headlights, which swivel to follow the road, can experience failures. Symptoms include headlights not leveling or swiveling properly, or error messages.
  • Solution: Replace the faulty headlight unit or control module.
  • Estimated Cost to Fix: $500 - $2000+ per headlight.
  • Recalls: None Found

Interior

• Sunroof Malfunctions
  • Description/Symptoms: The sunroof can experience issues such as getting stuck, making excessive noise, or failing to close properly.
  • Solution: Repair or replace the sunroof motor, tracks, or other components.
  • Estimated Cost to Fix: $300 - $1500+.
  • Recalls: None Found

Summary

The 2015 BMW 750Li, while offering luxury and performance, is prone to several potential issues. Engine oil and coolant leaks are common, along with turbocharger problems, especially in the 4.4L V8. The transmission can suffer from rough shifting and mechatronic unit failures. The air suspension system is also a known trouble spot. Electrical problems, particularly with the iDrive system and sensor malfunctions, are also prevalent. While some issues are relatively minor, others can be quite expensive to repair, making thorough pre-purchase inspection and ongoing maintenance crucial. The severity of these issues ranges from inconvenient to potentially disabling, and repair costs can range from a few hundred to several thousand dollars, making it a potentially expensive vehicle to maintain.