2006 BMW 650i

The 2006 BMW 650i is a luxury grand tourer that blends performance and style. It came equipped with the N62B48 4.8-liter V8 engine, producing 360 horsepower and 360 lb-ft of torque. There were two transmission options available: a 6-speed manual and a 6-speed automatic. Owners generally praise the 650i for its comfortable ride, stylish design, and powerful engine. Common complaints include high maintenance costs, electrical gremlins, and premature wear of certain components.

Engine

N62B48 4.8L V8

• Valve Stem Seal Failure
  • Description/Symptoms: Excessive oil consumption, blue smoke upon startup, especially after the car has been sitting for an extended period.
  • Solution: Replacement of the valve stem seals. Requires specialized tools and is labor intensive.
  • Estimated Cost to Fix: $3,000 - $5,000+
  • Recalls: None Found
• Coolant Transfer Pipe Leak (Valley Pan Leak)
  • Description/Symptoms: Coolant leak under the intake manifold. Can be difficult to detect early on. Symptoms may include low coolant level, overheating, and a sweet smell of coolant.
  • Solution: Replacement of the coolant transfer pipe, intake manifold gaskets, and possibly the valley pan gasket.
  • Estimated Cost to Fix: $2,000 - $4,000+
  • Recalls: None Found
• Alternator Bracket Oil Leak
  • Description/Symptoms: Oil leak around the alternator, typically caused by a failing gasket or seal in the alternator bracket.
  • Solution: Replacement of the alternator bracket gasket or seal.
  • Estimated Cost to Fix: $500 - $1000+
  • Recalls: None Found

Transmission

6-Speed Automatic (ZF 6HP26)

• Slipping or Harsh Shifting
  • Description/Symptoms: Transmission slipping between gears, harsh or delayed shifts, especially when cold.
  • Solution: Replacement of the valve body, solenoids, or full transmission rebuild.
  • Estimated Cost to Fix: $800 (valve body/solenoids) - $4,000+ (rebuild)
  • Recalls: None Found
• Mechatronic Sleeve Leak
  • Description/Symptoms: Transmission fluid leak from the mechatronic sleeve, where the wiring harness connects to the transmission. Low transmission fluid can cause shifting problems.
  • Solution: Replacement of the mechatronic sleeve and fluid service.
  • Estimated Cost to Fix: $400 - $800+
  • Recalls: None Found

Suspension

• Active Roll Stabilization (ARS) Failure
  • Description/Symptoms: Warning lights on the dashboard, clunking noises from the suspension, reduced handling performance, increased body roll.
  • Solution: Replacement of the ARS hydraulic unit, ARS pump, or sway bar actuators.
  • Estimated Cost to Fix: $1,000 - $3,000+
  • Recalls: None Found
• Air Suspension Compressor Failure (if equipped)
  • Description/Symptoms: Rear of the car sagging, inability to maintain proper ride height, warning lights on the dashboard.
  • Solution: Replacement of the air suspension compressor, air struts, or air lines.
  • Estimated Cost to Fix: $800 - $2,000+
  • Recalls: None Found

Electrical

• Battery Drain Issues
  • Description/Symptoms: Battery draining overnight or within a few days, difficulty starting the car, electrical malfunctions.
  • Solution: Identifying and resolving the parasitic drain (e.g., faulty module, aftermarket accessories). May require extensive diagnostic work.
  • Estimated Cost to Fix: $100 - $1,000+ (depending on the source of the drain)
  • Recalls: None Found
• iDrive System Malfunctions
  • Description/Symptoms: iDrive screen freezing, buttons not responding, system rebooting, navigation issues.
  • Solution: Software update, replacement of the iDrive control module, or repair of faulty wiring.
  • Estimated Cost to Fix: $200 - $1,500+
  • Recalls: None Found
• Comfort Access Issues
  • Description/Symptoms: Keyless entry and start not working, difficulty locking or unlocking the car, inconsistent operation.
  • Solution: Replacement of door handle sensors, Comfort Access module, or key fob battery.
  • Estimated Cost to Fix: $200 - $800+
  • Recalls: None Found

Exterior

• Convertible Top Malfunctions (if applicable)
  • Description/Symptoms: Top failing to open or close completely, unusual noises during operation, error messages on the dashboard.
  • Solution: Repair or replacement of hydraulic cylinders, sensors, or the convertible top motor.
  • Estimated Cost to Fix: $500 - $3,000+
  • Recalls: None Found

Interior

• Sunroof Issues (if applicable)
  • Description/Symptoms: Sunroof failing to open or close, sticking, unusual noises during operation.
  • Solution: Repair or replacement of the sunroof motor, tracks, or cables.
  • Estimated Cost to Fix: $300 - $1,000+
  • Recalls: None Found

Summary

The 2006 BMW 650i, while a stylish and enjoyable grand tourer, is prone to several common issues. Engine problems, particularly valve stem seal and coolant leaks, can be expensive to repair. Transmission issues, especially with the automatic transmission, can also be costly. Electrical gremlins and suspension issues are other common concerns. While some repairs are relatively minor, many require specialized tools and expertise, leading to potentially high repair bills. Prospective buyers should be aware of these potential issues and budget accordingly.