2018 BMW 440i

The 2018 BMW 440i is a popular choice for those seeking a blend of performance and luxury in a coupe, convertible, or Gran Coupe (four-door coupe) package. The model is generally praised for its responsive handling, powerful engine, and stylish design. However, like any vehicle, it has its share of common issues. The 440i came standard with a 3.0-liter turbocharged inline-six engine (B58) producing 320 horsepower and 330 lb-ft of torque. This engine could be paired with either a 6-speed manual transmission (rare) or an 8-speed automatic transmission. Owners often appreciate the smooth power delivery and quick acceleration. Dislikes often revolve around the cost of maintenance and the potential for electrical gremlins.

Engine

B58 3.0L Turbocharged Inline-Six

• Oil Leaks (Valve Cover Gasket)
  • Description/Symptoms: Oil leaks are common around the valve cover gasket, leading to a burning smell, visible oil residue on the engine, and potentially low oil levels.
  • Solution: Replacement of the valve cover gasket.
  • Estimated Cost to Fix: $300 - $600+
  • Recalls: None Found
• Coolant Leaks (Water Pump/Thermostat Housing)
  • Description/Symptoms: Coolant leaks from the water pump or thermostat housing, resulting in low coolant levels, overheating, and a visible puddle of coolant under the vehicle. Sometimes accompanied by a “check engine” light.
  • Solution: Replacement of the water pump and/or thermostat housing. It’s often recommended to replace both at the same time as preventative maintenance.
  • Estimated Cost to Fix: $500 - $1000+
  • Recalls: None Found
• Timing Chain Issues (Early B58 Variants)
  • Description/Symptoms: While less common in the 2018 model year, some early B58 engines experienced timing chain stretch or failure. Symptoms include a rattling noise upon startup, especially when cold, and potential engine misfires. This issue isn’t as prevalent in later model years, but still worth noting.
  • Solution: Replacement of the timing chain, guides, and tensioner. This is a labor-intensive repair.
  • Estimated Cost to Fix: $2000 - $4000+
  • Recalls: None Found

Transmission

ZF 8HP 8-Speed Automatic

• Rough Shifting/Hesitation
  • Description/Symptoms: Some owners report experiencing rough shifting, particularly between certain gears, or hesitation when accelerating. This can be more noticeable in higher mileage vehicles.
  • Solution: Flushing and replacing the transmission fluid with the correct ZF fluid can sometimes alleviate the issue. In more severe cases, valve body replacement or complete transmission rebuild/replacement may be required.
  • Estimated Cost to Fix:
    • Fluid Change: $300 - $500+
    • Valve Body Replacement: $1500 - $3000+
    • Transmission Rebuild/Replacement: $4000 - $8000+
  • Recalls: None Found

Suspension

• Adaptive M Suspension Issues (if equipped)
  • Description/Symptoms: Vehicles equipped with the Adaptive M Suspension may experience issues with the electronic dampers. Symptoms include a harsh ride, uneven handling, and error messages related to the suspension system.
  • Solution: Diagnosis to determine the faulty damper(s), followed by replacement.
  • Estimated Cost to Fix: $500 - $1500+ per damper, plus labor.
  • Recalls: None Found

Electrical

• iDrive System Glitches/Failures
  • Description/Symptoms: The iDrive infotainment system can experience glitches, freezes, or complete failures. This can affect navigation, audio, climate control, and other vehicle functions.
  • Solution: Software updates may resolve some issues. In more severe cases, replacement of the iDrive control unit may be necessary.
  • Estimated Cost to Fix:
    • Software Update: $100 - $300+
    • iDrive Control Unit Replacement: $800 - $2000+
  • Recalls: None Found
• Battery Drain
  • Description/Symptoms: Excessive battery drain can occur, especially if the vehicle sits for extended periods. This can lead to difficulty starting the car or a completely dead battery.
  • Solution: Identify the source of the drain (e.g., faulty module, aftermarket accessory). Sometimes requires professional diagnosis. Replacing an aging battery is a common fix.
  • Estimated Cost to Fix:
    • Battery Replacement: $300 - $600+
    • Diagnosis & Repair of Drain Source: Varies widely depending on the issue.
  • Recalls: None Found

Exterior

• Cracked/Broken Exterior Trim
  • Description/Symptoms: Certain plastic exterior trim pieces, particularly around the windows or bumpers, may become brittle and crack or break, especially in regions with extreme temperatures.
  • Solution: Replacement of the damaged trim piece.
  • Estimated Cost to Fix: $100 - $500+ per piece, depending on the part.
  • Recalls: None Found

Interior

• Sunroof Issues
  • Description/Symptoms: Sunroofs on the 440i can sometimes experience problems with opening, closing, or sealing properly. This can lead to wind noise or water leaks.
  • Solution: Repair or replacement of the sunroof motor, tracks, or seals.
  • Estimated Cost to Fix: $300 - $1000+
  • Recalls: None Found

Summary

The 2018 BMW 440i, while a generally reliable and enjoyable vehicle, has potential issues that buyers should be aware of. Engine oil and coolant leaks, especially related to the valve cover gasket, water pump, and thermostat, are relatively common. Transmission issues like rough shifting can also occur. Electrical gremlins with the iDrive system and battery drain can be frustrating. The severity and cost of these issues can vary widely, but being informed can help buyers budget for potential repairs and properly inspect vehicles before purchase. Addressing these issues promptly can prevent further damage and maintain the vehicle’s performance and value.