2006 BMW 550i

The 2006 BMW 550i is a mid-size luxury sedan known for its blend of performance and comfort. It came with two engine options, the 4.4L N62 V8 (360 hp, 360 lb-ft torque) and a 3.0L Inline-6. It was available with either a 6-speed manual or a 6-speed automatic transmission. Owners often praise its handling, powerful V8 engine (when equipped), and luxurious interior. Common complaints include high maintenance costs, electrical issues, and the tendency for certain engine components to fail prematurely.

Engine

4.4L N62 V8

• Valve Stem Seal Failure
  • Description/Symptoms: Excessive oil consumption, blue smoke upon startup (especially after sitting for a while), and oil smell.
  • Solution: Replace valve stem seals. This is a labor-intensive job.
  • Estimated Cost to Fix: $3,000 - $5,000+
  • Recalls: None Found
• Coolant Transfer Pipe Leak
  • Description/Symptoms: Coolant leak from the rear of the engine, overheating, low coolant warning light. This pipe is located under the intake manifold V causing removal of the manifold and valley pan.
  • Solution: Replace the coolant transfer pipe, often with an updated aluminum version to prevent future leaks.
  • Estimated Cost to Fix: $1,500 - $3,000+
  • Recalls: None Found
• Alternator Bracket Oil Leak
  • Description/Symptoms: Oil leak near the front of the engine, oil smell, low oil level.
  • Solution: Replace the alternator bracket gasket.
  • Estimated Cost to Fix: $500 - $1,000+
  • Recalls: None Found
• Oil Leaks (Various Locations)
  • Description/Symptoms: Oil leaks from various locations including valve cover gaskets, oil pan gasket, and front crankshaft seal.
  • Solution: Replace the leaking gaskets or seals.
  • Estimated Cost to Fix: $200 - $1,500+ depending on the location and severity.
  • Recalls: None Found
• VANOS Solenoid Failure
  • Description/Symptoms: Rough idle, reduced power, check engine light.
  • Solution: Replace faulty VANOS solenoids.
  • Estimated Cost to Fix: $200 - $500+ per solenoid (typically requires two).
  • Recalls: None Found

3.0L Inline-6

No Issues Found

Transmission

6-Speed Automatic (GM 6L45/6L50 or ZF 6HP19/6HP26 depending on engine)

• Valve Body Issues
  • Description/Symptoms: Harsh or delayed shifting, slipping between gears, transmission malfunction warning.
  • Solution: Replace or rebuild the valve body. Some shops may offer a valve body rebuild kit instead of replacing the entire unit.
  • Estimated Cost to Fix: $1,500 - $3,500+
  • Recalls: None Found
• Mechatronic Sleeve Leak
  • Description/Symptoms: Transmission fluid leak near the transmission pan, shifting problems.
  • Solution: Replace the mechatronic sleeve (electrical connector sleeve).
  • Estimated Cost to Fix: $300 - $600+
  • Recalls: None Found

6-Speed Manual

No Issues Found

Suspension

• Air Suspension Failure (Rear)
  • Description/Symptoms: Rear of the car sagging, air compressor running constantly, suspension malfunction warning.
  • Solution: Replace the air springs (airbags), air compressor, or ride height sensors.
  • Estimated Cost to Fix: $500 - $2,000+ depending on the component.
  • Recalls: None Found
• Control Arm Bushing Wear
  • Description/Symptoms: Clunking noises from the suspension, poor handling, uneven tire wear.
  • Solution: Replace worn control arm bushings or entire control arms.
  • Estimated Cost to Fix: $300 - $1,000+ per control arm.
  • Recalls: None Found

Electrical

• Battery Drain
  • Description/Symptoms: Car battery draining overnight or after a few days of inactivity.
  • Solution: Diagnose and repair the parasitic drain. Common culprits include faulty modules or aftermarket accessories.
  • Estimated Cost to Fix: $100 - $1,000+ depending on the complexity of the issue.
  • Recalls: None Found
• iDrive System Malfunctions
  • Description/Symptoms: iDrive screen freezing, system rebooting, loss of functionality.
  • Solution: Software update, replacement of the iDrive control module (CCC unit).
  • Estimated Cost to Fix: $200 - $1,500+
  • Recalls: None Found
• Comfort Access Issues
  • Description/Symptoms: Comfort Access system failing to unlock or lock the doors, key not being recognized.
  • Solution: Replace faulty door handle sensors or Comfort Access module.
  • Estimated Cost to Fix: $300 - $800+ per door handle.
  • Recalls: None Found

Exterior

• Door Handle Cables
  • Description/Symptoms: Door handle becomes loose and does not open the door properly, or at all.
  • Solution: Replace door handle and cables.
  • Estimated Cost to Fix: $200 - $500+
  • Recalls: None Found

Interior

• Sunroof Issues
  • Description/Symptoms: Sunroof jamming, making noises, or failing to open/close properly.
  • Solution: Repair or replace the sunroof mechanism.
  • Estimated Cost to Fix: $300 - $1,200+
  • Recalls: None Found

Summary

The 2006 BMW 550i, while offering a luxurious driving experience, is prone to several issues that can lead to significant repair costs. Engine issues, particularly with the N62 V8, are common and often expensive to fix. Transmission issues can also be costly. Electrical gremlins are prevalent and can be difficult to diagnose. Overall, potential buyers should be aware of these potential issues and factor in the high cost of maintenance and repairs when considering this vehicle. Severity of issues can range from minor inconveniences to major mechanical failures requiring extensive repairs.