2021 BMW 420i Gran Coupe

Here’s a breakdown of common issues reported for the 2021 BMW 420i Gran Coupe, formatted as requested.

The 2021 BMW 420i Gran Coupe is a stylish and practical four-door coupe that offers a blend of sporty driving dynamics and everyday usability. In addition to the 420i, other engine options available for the 4 Series Gran Coupe include the more powerful 430i and the M440i. The 420i is powered by a 2.0-liter turbocharged inline-4 engine producing around 180-184 horsepower and 221 lb-ft of torque, providing adequate performance for most drivers. Positives often cited about the 420i Gran Coupe include its sleek design, comfortable interior, and nimble handling. Criticisms frequently involve the relatively modest power output of the base engine and the sometimes controversial styling details (particularly the large kidney grilles).

Engine

2.0L Turbocharged Inline-4 (B48)

• Oil Leaks
  • Description/Symptoms: Oil leaks may originate from various points including the valve cover gasket, oil filter housing gasket, or the oil pan gasket. Symptoms include visible oil drips under the car, the smell of burning oil, and low oil levels.
  • Solution: Replacing the affected gasket or seal is the typical repair. Cleaning the affected area after the repair is also crucial.
  • Estimated Cost to Fix: $200 - $1,000+ depending on the location and complexity of the repair.
  • Recalls: None Found
• Coolant Leaks
  • Description/Symptoms: Coolant leaks can occur from the water pump, radiator hoses, or the coolant expansion tank. Symptoms include a sweet smell, low coolant level warning, and overheating.
  • Solution: Replacing the leaking component and topping off the coolant. A pressure test may be performed to locate the source of the leak.
  • Estimated Cost to Fix: $150 - $800+ depending on the component and labor.
  • Recalls: None Found

Transmission

8-Speed Automatic (ZF 8HP)

• Rough Shifting/Hesitation
  • Description/Symptoms: Some owners report experiencing rough or jerky shifting, particularly at lower speeds. Hesitation when accelerating is also reported.
  • Solution: A software update or transmission adaptation reset may resolve the issue. In some cases, a transmission fluid change is recommended. In more severe cases, valve body replacement might be required.
  • Estimated Cost to Fix: $100 (software) - $2,000+ (valve body).
  • Recalls: None Found

Suspension

• No Issues Found

Electrical

• iDrive System Glitches/Freezing
  • Description/Symptoms: Reports of the iDrive infotainment system freezing, crashing, or exhibiting other glitches. This can affect navigation, audio, and climate control.
  • Solution: Attempting a system reset (holding the volume button). Software updates are often released to address these issues. In rare cases, the iDrive module might need replacement.
  • Estimated Cost to Fix: $0 (reset/update) - $1,500+ (module replacement).
  • Recalls: None Found
• Battery Drain
  • Description/Symptoms: Premature battery drain leading to starting issues, especially after the car has been sitting for a few days.
  • Solution: Diagnosing and addressing parasitic draws, such as faulty modules not shutting down properly. Replacing the battery and registering the new battery to the vehicle’s computer system.
  • Estimated Cost to Fix: $150 - $500+ depending on the source of the drain.
  • Recalls: None Found

Exterior

• No Issues Found

Interior

• Creaking/Rattling Noises
  • Description/Symptoms: Various creaking or rattling noises emanating from the dashboard, door panels, or rear parcel shelf. These noises can be exacerbated by temperature changes.
  • Solution: Identifying the source of the noise and applying felt tape or other sound-deadening material. Tightening loose panels or fasteners.
  • Estimated Cost to Fix: $50 - $300+ depending on the complexity and the need for professional labor.
  • Recalls: None Found

Summary

The 2021 BMW 420i Gran Coupe appears to have a mix of relatively minor and potentially more significant issues. Engine oil leaks and transmission issues (rough shifting) are the most concerning areas. Electrical glitches with the iDrive system and battery drain are also frequently reported. The cost of repairs can range from relatively inexpensive software updates or gasket replacements to more costly valve body replacements or module replacements. Overall, it’s important to be diligent in checking for these issues during a pre-purchase inspection and to maintain a regular service schedule to mitigate potential problems.