2020 BMW 520i

The 2020 BMW 520i is part of the G30 5-Series generation, known for its blend of luxury, technology, and driving dynamics. The 520i is the entry-level model often praised for its comfortable ride, spacious interior, and user-friendly iDrive infotainment system. Some common criticisms include its relatively modest power output compared to higher-spec models and a perceived lack of driver engagement compared to older BMW models. In addition to the 520i, the 2020 5-Series was also available with other engine options, including the 530i (2.0L turbocharged inline-4), 540i (3.0L turbocharged inline-6), and M550i (4.4L twin-turbocharged V8) as well as diesel options in some markets. The 2020 BMW 520i features a 2.0-liter turbocharged inline-4 engine producing approximately 184 horsepower and 214 lb-ft of torque. All engine options were paired with an 8-speed automatic transmission.

Engine

2.0L Turbocharged Inline-4 (B48)

• Timing Chain Issues
  • Description/Symptoms: Excessive engine noise, particularly rattling at startup or during acceleration. The timing chain may stretch or the tensioner may fail prematurely, leading to potential engine damage if not addressed.
  • Solution: Replacement of the timing chain, tensioner, and associated guides.
  • Estimated Cost to Fix: $1,500 - $3,000+
  • Recalls: None Found
• Coolant Leaks
  • Description/Symptoms: Coolant level decreasing, visible coolant leaks around the engine, or engine overheating. The plastic components of the cooling system, such as the coolant expansion tank or the thermostat housing, are prone to cracking and leaking.
  • Solution: Replacement of the leaking cooling system components (expansion tank, thermostat housing, hoses, etc.).
  • Estimated Cost to Fix: $200 - $1,000+
  • Recalls: None Found
• Oil Filter Housing Gasket Leak
  • Description/Symptoms: Oil leaks near the oil filter housing, burning oil smell, low oil level.
  • Solution: Replacement of the oil filter housing gasket.
  • Estimated Cost to Fix: $400 - $800+
  • Recalls: None Found

Transmission

8-Speed Automatic (ZF 8HP)

• Rough Shifting/Hesitation
  • Description/Symptoms: Harsh or delayed shifts between gears, particularly at lower speeds. Hesitation during acceleration or when downshifting.
  • Solution: Performing a transmission fluid flush and filter replacement may alleviate the issue. In more severe cases, valve body replacement or a full transmission rebuild may be necessary.
  • Estimated Cost to Fix: $300 - $4,000+
  • Recalls: None Found
• Mechatronic Unit Failure
  • Description/Symptoms: Transmission slipping, failure to shift gears, or going into limp mode. The mechatronic unit (the transmission’s control unit) can fail due to electrical or mechanical issues.
  • Solution: Replacement or reprogramming of the mechatronic unit.
  • Estimated Cost to Fix: $1,500 - $3,500+
  • Recalls: None Found

Suspension

• No Issues Found

Electrical

• iDrive System Issues
  • Description/Symptoms: Freezing, lagging, or rebooting of the iDrive infotainment system. Software glitches, connectivity problems (Bluetooth, Apple CarPlay/Android Auto), or malfunctions in the display screen.
  • Solution: Software update, replacement of iDrive module, or troubleshooting wiring issues.
  • Estimated Cost to Fix: $100 - $1,500+
  • Recalls: None Found
• Battery Drain
  • Description/Symptoms: The battery draining quickly, requiring frequent jump-starts, or the car failing to start after being parked for a short period. Potential causes include a faulty alternator, parasitic drain from electrical components, or a failing battery.
  • Solution: Diagnosing and repairing the source of the parasitic drain, replacing the alternator, or replacing the battery.
  • Estimated Cost to Fix: $100 - $800+
  • Recalls: None Found
• Parking Sensor Malfunctions
  • Description/Symptoms: Erratic or false alarms from the parking sensors, failure of the sensors to detect obstacles, or error messages on the iDrive display.
  • Solution: Cleaning or replacing the faulty parking sensors, checking and repairing wiring connections, or reprogramming the parking sensor module.
  • Estimated Cost to Fix: $100 - $500+
  • Recalls: None Found

Exterior

• No Issues Found

Interior

• Seat Heater Failure
  • Description/Symptoms: The seat heaters not working, heating unevenly, or turning off intermittently. This can be due to a faulty heating element or a problem with the control module.
  • Solution: Replacement of the heating element or the seat heater control module.
  • Estimated Cost to Fix: $200 - $800+
  • Recalls: None Found

Summary

The 2020 BMW 520i has a number of potential issues, with the most concerning relating to the engine (timing chain, coolant leaks) and transmission (rough shifting, mechatronic unit failure). Electrical issues, particularly with the iDrive system, can also be frustrating. While some issues, like coolant leaks and electrical glitches, are relatively inexpensive to address, engine and transmission repairs can be costly, potentially exceeding several thousand dollars. Overall, prospective buyers should be aware of these potential issues and have the vehicle thoroughly inspected before purchase.