2015 BMW 750i

The 2015 BMW 750i is a luxury sedan known for its powerful engine, comfortable ride, and opulent interior. It’s generally praised for its performance, sophisticated features, and spacious cabin. However, some owners have reported issues that can be costly to repair. The 2015 750i features a 4.4-liter TwinPower Turbo V8 engine producing 445 horsepower and 480 lb-ft of torque, paired with an eight-speed automatic transmission. Some common complaints about the 750i include electrical glitches, oil leaks, and the high cost of maintenance and repairs. Some owners have expressed frustration with the complex technology and potential reliability issues, which could lead to expensive repairs.

Engine

4.4L TwinPower Turbo V8

• Oil Leaks
  • Description/Symptoms: Oil leaks can occur from various locations, including the valve cover gaskets, oil filter housing gasket, and the turbocharger oil lines. Symptoms include visible oil leaks on the engine or ground, burning oil smell, and low oil level warning.
  • Solution: Replace the leaking gasket or component. It’s recommended to replace all gaskets in the affected area for preventative maintenance.
  • Estimated Cost to Fix: $300 - $1500+ depending on the location and extent of the leak.
  • Recalls: None Found
• Coolant Leaks
  • Description/Symptoms: Coolant leaks can occur from the coolant expansion tank, radiator hoses, or water pump. Symptoms include visible coolant leaks on the ground, low coolant level warning, and overheating.
  • Solution: Replace the leaking component. It’s recommended to pressure test the cooling system to locate all leaks.
  • Estimated Cost to Fix: $200 - $1000+ depending on the location and component.
  • Recalls: None Found
• Turbocharger Issues
  • Description/Symptoms: The twin turbochargers can experience failures, leading to reduced power, whistling noises, and check engine lights.
  • Solution: Inspect the turbochargers for damage or leaks. Replacement or rebuild of the turbochargers is often necessary.
  • Estimated Cost to Fix: $2,500 - $5,000+ depending on whether you replace or rebuild.
  • Recalls: None Found

Transmission

8-Speed Automatic

• Rough Shifting
  • Description/Symptoms: Some owners report experiencing rough or delayed shifts, particularly when the transmission is cold. The transmission may also exhibit harsh downshifts.
  • Solution: A transmission fluid flush and filter change may alleviate the issue. If the problem persists, valve body issues or more severe internal damage may require repair or replacement.
  • Estimated Cost to Fix: $300 for fluid flush; $1,500 - $5,000+ for valve body repair or transmission replacement.
  • Recalls: None Found
• Mechatronic Unit Failure
  • Description/Symptoms: The mechatronic unit, which controls the transmission’s hydraulic functions, can fail, leading to erratic shifting, limp mode, or complete transmission failure.
  • Solution: Replace the mechatronic unit. This requires specialized knowledge and tools.
  • Estimated Cost to Fix: $2,000 - $4,000+
  • Recalls: None Found

Suspension

• Air Suspension Compressor Failure
  • Description/Symptoms: The air suspension compressor can fail, causing the vehicle to sit unevenly or sag completely. Warning lights for suspension malfunctions will illuminate.
  • Solution: Replace the air suspension compressor. It’s recommended to inspect the air struts for leaks as well.
  • Estimated Cost to Fix: $800 - $2,000+
  • Recalls: None Found
• Air Strut Leaks
  • Description/Symptoms: The air struts can develop leaks, leading to ride height issues and suspension malfunction warnings. The vehicle may sag overnight or while parked.
  • Solution: Replace the leaking air struts. Replacing them in pairs is recommended.
  • Estimated Cost to Fix: $1,000 - $3,000+ per pair
  • Recalls: None Found

Electrical

• iDrive System Malfunctions
  • Description/Symptoms: The iDrive infotainment system can experience glitches, freezes, or complete failures.
  • Solution: Software updates may resolve some issues. In severe cases, the iDrive control unit may need replacement.
  • Estimated Cost to Fix: $100 - $300 for software updates; $1,000 - $3,000+ for control unit replacement
  • Recalls: None Found
• Battery Drain Issues
  • Description/Symptoms: Some owners report issues with rapid battery drain, particularly when the vehicle is left unused for extended periods.
  • Solution: Identify the parasitic drain using diagnostic tools. Faulty modules or wiring issues are often the cause.
  • Estimated Cost to Fix: $100 - $1,000+ depending on the source of the drain.
  • Recalls: None Found
• Sensor Failures
  • Description/Symptoms: Various sensors, such as those for the parking assist, blind spot monitoring, and tire pressure monitoring systems, can fail, leading to warning lights and system malfunctions.
  • Solution: Replace the faulty sensor.
  • Estimated Cost to Fix: $200 - $800+ per sensor.
  • Recalls: None Found

Exterior

• Adaptive Headlight Problems
  • Description/Symptoms: The adaptive headlights, which swivel to illuminate the road ahead, can develop malfunctions, causing them to point in the wrong direction or fail to adjust.
  • Solution: Replace the headlight assembly or the adaptive headlight control module.
  • Estimated Cost to Fix: $800 - $2,000+ per headlight.
  • Recalls: None Found

Interior

• Seat Adjustment Issues
  • Description/Symptoms: The power seat motors or control modules can fail, leading to limited or no seat adjustment.
  • Solution: Replace the faulty motor or control module.
  • Estimated Cost to Fix: $300 - $1,000+ per seat.
  • Recalls: None Found
• Sunroof Problems
  • Description/Symptoms: The sunroof mechanism can malfunction, causing it to stick, fail to open or close properly, or leak.
  • Solution: Repair or replace the sunroof mechanism, including the motor and tracks.
  • Estimated Cost to Fix: $500 - $1,500+
  • Recalls: None Found

Summary

The 2015 BMW 750i offers a luxurious driving experience, but potential owners should be aware of the common issues. Engine oil and coolant leaks, transmission problems, and electrical glitches are among the most frequently reported concerns. The cost of repairs can be significant, particularly for suspension, turbocharger, and iDrive system issues. While some problems may be minor and inexpensive to fix, others can lead to substantial repair bills. Due to the nature of the vehicle, all issues could cost more than some other cars.