2016 BMW 640i

The 2016 BMW 640i is a luxury grand tourer known for its elegant styling, comfortable ride, and powerful engine. Available as a coupe, convertible, or Gran Coupe (four-door coupe), the 640i offers a blend of performance and sophistication. The 2016 640i is powered by a 3.0-liter turbocharged inline-6 engine producing 315 horsepower and 332 lb-ft of torque. Other engine options available for the 6 Series include a more powerful inline 6 producing 445 hp and a V8 producing 560 hp. All engines were paired with an 8-speed automatic transmission. Owners generally praise the 640i for its smooth engine, luxurious interior, and comfortable long-distance cruising capabilities. However, some common complaints include relatively high running costs, complex electronics that can be prone to glitches, and limited rear-seat space in the coupe models.

Engine

3.0L Turbocharged Inline-6 (N55)

• Oil Leaks (Valve Cover Gasket)
  • Description/Symptoms: Oil leaks from the valve cover gasket onto the exhaust manifold, causing a burning smell and potentially visible smoke. Oil levels may decrease, requiring more frequent top-offs.
  • Solution: Replacement of the valve cover gasket.
  • Estimated Cost to Fix: $400 - $800+
  • Recalls: None Found
• VANOS Solenoid Failure
  • Description/Symptoms: The VANOS (Variable Valve Timing) system controls the timing of the intake and exhaust valves. Faulty VANOS solenoids can cause rough idling, decreased power, and poor fuel economy. Diagnostic codes related to VANOS issues may be present.
  • Solution: Replacement of the faulty VANOS solenoid(s).
  • Estimated Cost to Fix: $300 - $600+
  • Recalls: None Found

Transmission

8-Speed Automatic (ZF 8HP)

• Harsh Shifting/Hesitation
  • Description/Symptoms: Some owners report occasional harsh shifts, particularly when downshifting or shifting at lower speeds. Hesitation when accelerating from a stop may also occur.
  • Solution: In some cases, a software update can resolve the issue. In other cases, valve body replacement may be required.
  • Estimated Cost to Fix: $200 (software update) - $1,500+ (valve body replacement)
  • Recalls: None Found
• Mechatronic Sleeve Leak
  • Description/Symptoms: The mechatronic sleeve is a rubber seal that connects the transmission’s internal wiring harness to the external control unit (mechatronic). Over time, this sleeve can degrade and leak transmission fluid.
  • Solution: Replacement of the mechatronic sleeve and transmission fluid service.
  • Estimated Cost to Fix: $500 - $1000+
  • Recalls: None Found

Suspension

• Adaptive Damper Failure (If Equipped)
  • Description/Symptoms: Cars equipped with the adaptive suspension option may experience damper failure. Symptoms include a noticeably bouncy ride, poor handling, and a clunking noise from the affected corner of the vehicle. A warning light may illuminate on the dashboard.
  • Solution: Replacement of the faulty adaptive damper(s).
  • Estimated Cost to Fix: $800 - $1500+ per damper
  • Recalls: None Found

Electrical

• iDrive System Issues
  • Description/Symptoms: The iDrive infotainment system can experience various glitches, including freezing, slow response times, and occasional system crashes. Connectivity issues with Bluetooth or other devices may also occur.
  • Solution: Software updates may resolve some issues. In more severe cases, replacement of the iDrive control unit may be necessary.
  • Estimated Cost to Fix: $0 (software update) - $1,200+ (control unit replacement)
  • Recalls: None Found
• Battery Drain
  • Description/Symptoms: Some owners report issues with excessive battery drain, particularly if the car is left unused for extended periods. This can result in difficulty starting the vehicle or a completely dead battery.
  • Solution: Diagnose and address the source of the parasitic drain. This may involve checking for faulty modules or aftermarket accessories that are drawing power when the car is off. Battery replacement may also be necessary if the battery is old or damaged.
  • Estimated Cost to Fix: $100 - $500+ (depending on the source of the drain)
  • Recalls: None Found

Exterior

• Door Handle Issues (Comfort Access)
  • Description/Symptoms: Vehicles equipped with the Comfort Access system (keyless entry) can experience issues with the door handles. The handles may fail to unlock or lock the doors, or they may become unresponsive.
  • Solution: Replacement of the faulty door handle(s).
  • Estimated Cost to Fix: $500 - $1000+ per handle
  • Recalls: None Found

Interior

• No Issues Found

Summary

The 2016 BMW 640i is a generally reliable luxury vehicle, but like any car, it has its share of potential problems. The most common issues appear to be related to oil leaks, transmission issues, and electrical glitches. The severity and cost of these issues can vary widely, but some repairs, such as adaptive damper replacement or iDrive control unit replacement, can be relatively expensive. Potential buyers should be aware of these potential issues and factor them into their purchasing decision. Pre-purchase inspections by a qualified BMW mechanic are highly recommended.