2009 BMW 750Li

The 2009 BMW 750Li represents the fifth generation (F01/F02) of BMW’s flagship sedan. The 750Li, being the long-wheelbase version, offers increased rear passenger legroom. For the 2009 model year, the 750Li came standard with a 4.4-liter twin-turbocharged V8 engine producing 400 horsepower and 450 lb-ft of torque. All engines were paired with a 6-speed automatic transmission. Owners typically praised the 750Li for its luxurious interior, smooth ride, and powerful engine, while common complaints revolved around the vehicle’s complex electronics, high maintenance costs, and potential for expensive repairs.

Engine

N63 4.4L Twin-Turbo V8

• Oil Leaks
  • Description/Symptoms: Oil leaks are a common issue, often originating from the valve cover gaskets, oil pan gasket, and turbocharger oil lines. Symptoms include visible oil leaks on the engine or ground, burning oil smell, and low oil level warnings.
  • Solution: Replacing the leaking gaskets or lines.
  • Estimated Cost to Fix: $500 - $1500+ depending on the source of the leak and shop labor rates.
  • Recalls: None Found
• Coolant Leaks
  • Description/Symptoms: Coolant leaks can occur from various points in the cooling system, including the coolant expansion tank, hoses, and water pump. Symptoms include low coolant level, overheating, and visible coolant leaks.
  • Solution: Replace the leaking components, which may include the coolant expansion tank, hoses, or water pump.
  • Estimated Cost to Fix: $300 - $1000+ depending on the component and shop labor rates.
  • Recalls: None Found
• High Oil Consumption
  • Description/Symptoms: The N63 engine in these models can be prone to high oil consumption. Symptoms include needing to add oil frequently between oil changes and blue smoke from the exhaust.
  • Solution: In severe cases, piston ring replacement may be necessary, though this is a costly and involved repair. Other potential solutions include replacing the valve stem seals.
  • Estimated Cost to Fix: $500-$5000+ depending on the cause and repair.
  • Recalls: None Found

Transmission

ZF 6HP26 6-Speed Automatic

• Slipping/Harsh Shifting
  • Description/Symptoms: The ZF 6HP26 transmission can experience slipping between gears, harsh or delayed shifting, and general poor performance. This is often related to low fluid levels, contaminated fluid, or worn valve body components.
  • Solution: Start with a transmission fluid flush and filter replacement using the correct BMW-approved fluid. If the problem persists, valve body repair or replacement may be necessary. In severe cases, a full transmission rebuild or replacement is required.
  • Estimated Cost to Fix: $300 for fluid/filter change, $800-$2500 for valve body repair/replacement, $3000-$6000+ for rebuild/replacement.
  • Recalls: None Found

Suspension

• Air Suspension Failure
  • Description/Symptoms: The 750Li is equipped with an air suspension system that can experience failures, primarily due to leaks in the air struts or compressor failure. Symptoms include a sagging vehicle, uneven ride height, and error messages on the iDrive system.
  • Solution: Replace the faulty air struts or compressor. It’s generally recommended to replace air struts in pairs.
  • Estimated Cost to Fix: $800 - $2000+ per strut, $500 - $1000+ for the compressor, plus labor.
  • Recalls: None Found

Electrical

• iDrive Issues
  • Description/Symptoms: The iDrive system can experience various issues, including freezing, slow response times, and complete failure.
  • Solution: Software updates can sometimes resolve the issue. In more severe cases, the iDrive controller or head unit may need to be replaced.
  • Estimated Cost to Fix: $100 - $300 for software update, $500 - $1500+ for component replacement.
  • Recalls: None Found
• Battery Drain
  • Description/Symptoms: Excessive battery drain is a common complaint, often caused by a faulty module not properly going to sleep, an aftermarket electrical component drawing too much power, or a failing battery.
  • Solution: Diagnosing the source of the drain and repairing or replacing the faulty component.
  • Estimated Cost to Fix: $100 (diagnostic) - $1000+ depending on the source of the drain.
  • Recalls: None Found

Exterior

• Xenon Headlight Issues
  • Description/Symptoms: Xenon headlights can flicker, turn off intermittently, or fail completely.
  • Solution: Replacing the bulbs or ballasts.
  • Estimated Cost to Fix: $200 - $500+
  • Recalls: None Found

Interior

• Seat Actuator Failure
  • Description/Symptoms: The electric seat actuators can fail, preventing the seat from adjusting properly.
  • Solution: Replacing the faulty actuator.
  • Estimated Cost to Fix: $300 - $800+
  • Recalls: None Found

Summary

The 2009 BMW 750Li, while offering a luxurious driving experience, is known for its potential for costly repairs. The most common issues revolve around the engine, transmission, suspension, and electrical systems. Oil leaks, air suspension failures, and iDrive problems are prevalent and can result in significant repair bills. Prospective buyers should be aware of these potential issues and factor in higher-than-average maintenance costs when considering this vehicle.