2020 BMW 745e

The 2020 BMW 745e is a plug-in hybrid variant of the seventh-generation (G11/G12) 7 Series. It combines a 3.0-liter turbocharged inline-six gasoline engine with an electric motor, producing a combined output of 389 horsepower and 442 lb-ft of torque. The engine is paired with an 8-speed automatic transmission. Other powertrain options for the 2020 7 Series include various gasoline and diesel engines, ranging from a 3.0-liter inline-six to a 6.6-liter V12, as well as all-wheel drive (xDrive) on some models. Owners generally appreciate the 745e for its blend of luxury, performance, and fuel efficiency, especially in electric-only mode for shorter commutes. Common dislikes include the reduced trunk space due to the battery pack, the complexity of the hybrid system leading to potential reliability concerns, and the higher initial cost compared to non-hybrid models.

Electric Motor

• Electric Motor Failure
  • Description/Symptoms: Complete failure of the electric motor, reduced electric range, error messages related to the electric drive system.
  • Solution: Replacement of the electric motor.
  • Estimated Cost to Fix: $8,000 - $12,000+
  • Recalls: None Found
• High Voltage Battery Faults
  • Description/Symptoms: Reduced battery capacity, inability to charge the battery, error messages related to the high voltage battery, or sudden loss of power.
  • Solution: Diagnosis by a qualified technician, potential replacement of battery modules or the entire battery pack.
  • Estimated Cost to Fix: $10,000 - $20,000+
  • Recalls: None Found

Engine

3.0L Turbocharged Inline-Six (B58)

• Coolant Leaks
  • Description/Symptoms: Coolant leaks originating from the cylinder head or other engine components, leading to low coolant levels and potential overheating.
  • Solution: Repair or replacement of the leaking components, such as gaskets, hoses, or the cylinder head itself.
  • Estimated Cost to Fix: $500 - $2,000+
  • Recalls: None Found
• Oil Filter Housing Leaks
  • Description/Symptoms: Oil leaking from the oil filter housing, often dripping onto other engine components.
  • Solution: Replacement of the oil filter housing gasket.
  • Estimated Cost to Fix: $200 - $500
  • Recalls: None Found

Transmission

8-Speed Automatic (ZF 8HP)

• Rough Shifting/Hesitation
  • Description/Symptoms: Harsh or delayed shifting, particularly between certain gears. Hesitation when accelerating.
  • Solution: Transmission fluid flush and filter change, software update. If the problem persists, valve body replacement or complete transmission rebuild/replacement may be necessary.
  • Estimated Cost to Fix: $300 - $5,000+ (depending on the severity and required repair)
  • Recalls: None Found

Suspension

• Air Suspension Failure
  • Description/Symptoms: Uneven ride height, sagging suspension, warning lights related to the air suspension system, compressor failure.
  • Solution: Replacement of the air struts, air compressor, or related sensors and lines.
  • Estimated Cost to Fix: $1,000 - $4,000+ per strut, $800 - $1,500 for the compressor
  • Recalls: None Found

Electrical

• iDrive System Issues
  • Description/Symptoms: Freezing, slow response times, random reboots, or complete failure of the iDrive infotainment system.
  • Solution: Software update, replacement of the iDrive control unit.
  • Estimated Cost to Fix: $200 - $1,500+
  • Recalls: None Found
• Sensor Malfunctions
  • Description/Symptoms: Various warning lights related to driver assistance systems (e.g., lane departure warning, blind-spot monitoring), parking sensors not working correctly, or adaptive cruise control malfunctions.
  • Solution: Diagnosis and replacement of the faulty sensor(s).
  • Estimated Cost to Fix: $200 - $800+ per sensor
  • Recalls: None Found

Exterior

• Automatic Trunk Issues
  • Description/Symptoms: Trunk fails to open or close automatically, or has difficulty latching correctly.
  • Solution: Repair or replacement of the trunk struts, latch mechanism, or related sensors.
  • Estimated Cost to Fix: $300 - $1,000+
  • Recalls: None Found

Interior

• Seat Adjustment Problems
  • Description/Symptoms: Seats not adjusting correctly, motors failing, or unusual noises when adjusting.
  • Solution: Repair or replacement of the seat motors, gears, or switches.
  • Estimated Cost to Fix: $300 - $1,200+ per seat
• Sunroof Malfunctions
  • Description/Symptoms: Sunroof failing to open or close properly, getting stuck, or leaking.
  • Solution: Repair or replacement of the sunroof motor, tracks, or seals.
  • Estimated Cost to Fix: $500 - $1,500+
  • Recalls: None Found

Summary

The 2020 BMW 745e, while offering a luxurious and technologically advanced driving experience, can be susceptible to several issues. The most significant concerns revolve around the electric motor and high-voltage battery, which can lead to very expensive repairs. Issues with the air suspension, iDrive system, and other electrical components also contribute to the potential for costly maintenance. While some issues may be relatively minor, others can result in significant repair bills, making it essential for prospective buyers to have a pre-purchase inspection performed by a qualified mechanic with experience working on BMW hybrids.