2018 BMW 420i

The 2018 BMW 420i is a stylish and sporty coupe, gran coupe, and convertible that offers a blend of luxury and performance. The 420i model features a 2.0-liter turbocharged inline-4 engine producing 180 horsepower and 200 lb-ft of torque. Other engine options for the 2018 4 Series include the more powerful 430i with 248 horsepower and the 440i with 320 horsepower. Transmission options include an 8-speed automatic transmission. Owners generally appreciate the 420i’s sleek design, agile handling, and comfortable interior. However, some common dislikes include the higher cost of maintenance compared to other vehicles, the limited rear seat space in the coupe model, and potential issues with certain electronic features.

Engine

2.0L Turbocharged Inline-4 (B48)

• Oil Leaks
  • Description/Symptoms: Oil leaks can occur from various points, including the valve cover gasket and the oil filter housing. Symptoms include visible oil leaks on the engine or under the car, burning oil smell, and low oil level warning lights.
  • Solution: Replacing the leaking gasket or seal.
  • Estimated Cost to Fix: $200 - $600+
  • Recalls: None Found
• Coolant Leaks
  • Description/Symptoms: Coolant leaks can occur from the water pump, coolant hoses, or the radiator. Symptoms include a sweet smell, low coolant levels, and overheating.
  • Solution: Replacing the faulty water pump, hoses, or radiator.
  • Estimated Cost to Fix: $300 - $1000+
  • Recalls: None Found

Transmission

8-Speed Automatic (ZF 8HP)

• Rough Shifting/Hesitation
  • Description/Symptoms: Some owners have reported rough shifting or hesitation during gear changes, particularly at lower speeds. This can manifest as a noticeable jerk or delay when accelerating.
  • Solution: A software update may resolve the issue in some cases. If not, a transmission fluid flush or valve body replacement may be necessary.
  • Estimated Cost to Fix: $150 (software update) - $1000+ (valve body)
  • Recalls: None Found

Suspension

No Issues Found

Electrical

• iDrive System Issues
  • Description/Symptoms: The iDrive infotainment system can experience glitches, freezing, or failure to respond to inputs. This can affect navigation, audio, and other vehicle functions.
  • Solution: Restarting the system, updating the software, or replacing the iDrive controller.
  • Estimated Cost to Fix: $0 (restart) - $200+ (software update) - $500+ (controller replacement)
  • Recalls: None Found
• Sensor Malfunctions
  • Description/Symptoms: Various sensors, such as the parking sensors or tire pressure sensors, may malfunction, leading to inaccurate readings or warning lights.
  • Solution: Replacing the faulty sensor.
  • Estimated Cost to Fix: $100 - $500+ (depending on the sensor)
  • Recalls: None Found

Exterior

• Door Lock Actuator Failure
  • Description/Symptoms: The door lock actuator can fail, causing the door to not lock or unlock properly.
  • Solution: Replacing the faulty door lock actuator.
  • Estimated Cost to Fix: $200 - $500+
  • Recalls: None Found

Interior

• Seat Motor Issues
  • Description/Symptoms: The electric seat motors can fail, preventing the seat from adjusting properly.
  • Solution: Replacing the faulty seat motor.
  • Estimated Cost to Fix: $300 - $800+
  • Recalls: None Found
• Sunroof Issues
  • Description/Symptoms: The sunroof motor can fail, causing the sunroof to get stuck, or fail to operate properly.
  • Solution: Replacing the sunroof motor.
  • Estimated Cost to Fix: $500 - $1000+
  • Recalls: None Found

Summary

The 2018 BMW 420i, while a desirable vehicle, has some common issues to be aware of. Engine oil and coolant leaks are relatively common and can be costly to repair. Electrical issues with the iDrive system and sensors also appear, although often less severe. Transmission problems such as rough shifting can occur. The severity of these issues ranges from minor inconveniences to potentially expensive repairs, but no recalls have been issued. Potential buyers should consider these factors and ensure a thorough inspection before purchasing a used 2018 BMW 420i.