2016 BMW 420i

Here is a comprehensive breakdown of common issues and complaints reported by owners of the 2016 BMW 420i. This information is based on owner reports, forum discussions, and common repair trends. The 2016 BMW 420i is part of the F32/F33/F36 4 Series generation. Other engine options available in the 2016 4 Series range include the 428i/430i (2.0L Turbo I4) and the 435i/440i (3.0L Turbo I6). The 420i features a 2.0L turbocharged inline-4 engine producing approximately 180 horsepower and 200 lb-ft of torque. Drivers often appreciate the 420i for its stylish design, sporty handling, and fuel efficiency. Common dislikes include the relatively small rear seats and the cost of maintenance and repairs.

Engine

2.0L Turbocharged I4 (N20/B48)

• Oil Leaks
  • Description/Symptoms: Oil leaks are commonly reported, especially around the valve cover gasket, oil filter housing gasket, and oil pan gasket. Signs include oil spots under the car, a burning oil smell, and low oil levels.
  • Solution: Replacing the leaking gasket or seal is the typical fix. For more severe leaks, the entire component may need to be replaced.
  • Estimated Cost to Fix: $200 - $800+ depending on the location and severity of the leak.
  • Recalls: None Found
• Timing Chain Issues (N20 engine)
  • Description/Symptoms: This is a known issue with the N20 engine used in earlier 2016 420i models. Symptoms include a rattling noise upon startup, especially when cold. If left unaddressed, it can lead to engine damage.
  • Solution: Replacing the timing chain, tensioner, and guides. In some cases, the sprockets may also need replacement.
  • Estimated Cost to Fix: $1,500 - $3,000+
  • Recalls: None Found
• Coolant Leaks
  • Description/Symptoms: Coolant leaks can occur from various points, including the water pump, expansion tank, and hoses. Signs include low coolant levels, overheating, and a sweet smell.
  • Solution: Identifying and replacing the leaking component.
  • Estimated Cost to Fix: $200 - $1,000+ depending on the location and component.
  • Recalls: None Found

Transmission

8-Speed Automatic (ZF 8HP)

• Rough Shifting/Hesitation
  • Description/Symptoms: Some owners report rough shifting, particularly between gears 2-3 or 3-4, or hesitation when accelerating. This can be more pronounced when the transmission is cold.
  • Solution: Start with a transmission fluid flush and filter replacement. If the issue persists, it may require valve body replacement or transmission rebuild/replacement.
  • Estimated Cost to Fix: Fluid flush $300 - $500. Valve body replacement $1,500 - $2,500+. Transmission rebuild/replacement $3,000 - $7,000+
  • Recalls: None Found
• Mechatronic Unit Failure
  • Description/Symptoms: The mechatronic unit, which controls the transmission’s hydraulic system, can fail. Symptoms include erratic shifting, limp mode, or complete loss of drive.
  • Solution: Replacing the mechatronic unit. This often involves reprogramming the transmission control unit (TCU).
  • Estimated Cost to Fix: $2,000 - $4,000+
  • Recalls: None Found

Suspension

• No Issues Found

Electrical

• Faulty iDrive Screen/System
  • Description/Symptoms: Freezing, crashing, or unresponsive iDrive screen. Intermittent functionality.
  • Solution: Software updates, replacement of the iDrive control unit, or screen replacement.
  • Estimated Cost to Fix: $300 - $1,500+
  • Recalls: None Found
• Battery Drain
  • Description/Symptoms: Rapid battery drain, especially if the car sits for extended periods. Can be due to a parasitic draw from a faulty module or accessory.
  • Solution: Identifying and addressing the source of the parasitic draw. This may involve replacing a faulty module, repairing wiring, or disconnecting aftermarket accessories.
  • Estimated Cost to Fix: $100 - $500+ depending on the source of the drain.
  • Recalls: None Found
• Door Lock Actuator Failure
  • Description/Symptoms: Door does not lock or unlock correctly. Makes a buzzing sound but does not work.
  • Solution: Replacing the faulty door lock actuator.
  • Estimated Cost to Fix: $200 - $500+ per door
  • Recalls: None Found

Exterior

• Cracked/Broken Side Mirror Caps
  • Description/Symptoms: The side mirror caps are prone to damage. Easily cracked or broken
  • Solution: Replacing the Side Mirror Caps
  • Estimated Cost to Fix: $50 - $200+ per mirror
  • Recalls: None Found

Interior

• No Issues Found

Summary

The 2016 BMW 420i can present several potential issues that prospective buyers should be aware of. The most significant concern is related to the engine, particularly oil leaks and potential timing chain problems with the N20 engine, which can lead to costly repairs. Transmission issues, although less frequent, can also be expensive to address. Electrical problems such as iDrive malfunctions and battery drains can be annoying and require diagnosis. Overall, the severity of potential problems ranges from minor inconveniences to major mechanical failures. Repair costs can vary widely, but owners should be prepared for potentially high expenses associated with owning and maintaining a BMW.