2018 BMW 120i

Here’s a breakdown of common issues and complaints associated with the 2018 BMW 120i, categorized by major components and engine/transmission options. The 2018 BMW 120i is a compact hatchback known for its sporty handling and premium feel. The 120i typically features a turbocharged 2.0-liter four-cylinder engine producing around 184 horsepower and 214 lb-ft of torque. Other engine options available in the 2018 1 Series range include smaller displacement petrol and diesel engines. Transmission options are generally a 6-speed manual or an 8-speed automatic. Owners generally appreciate the 120i’s fuel efficiency, driving dynamics, and stylish interior. Some common complaints revolve around limited rear passenger space and higher maintenance costs compared to non-luxury brands.

Engine

2.0L Turbocharged Four-Cylinder (B48 Engine)

• Oil Leaks
  • Description/Symptoms: Oil leaks may occur from the valve cover gasket or the oil filter housing gasket. Symptoms include visible oil leaks on the engine, burning oil smell, and low oil level.
  • Solution: Replace the faulty gasket.
  • Estimated Cost to Fix: $200 - $500+
  • Recalls: None Found
• Coolant Leaks
  • Description/Symptoms: Coolant leaks may develop from the thermostat housing or radiator hoses. This can lead to overheating and engine damage if not addressed promptly.
  • Solution: Replace the faulty thermostat housing or hoses.
  • Estimated Cost to Fix: $150 - $400+
  • Recalls: None Found
• High Pressure Fuel Pump (HPFP) Failure
  • Description/Symptoms: The High Pressure Fuel Pump may fail leading to long crank times or failure to start the vehicle. There may be a reduction of power or the vehicle entering limp mode.
  • Solution: Replace the faulty HPFP
  • Estimated Cost to Fix: $800 - $1,500+
  • Recalls: None Found

Transmission

8-Speed Automatic (Aisin)

• Rough Shifting
  • Description/Symptoms: Harsh or jerky shifts, especially during acceleration or deceleration. This might be more noticeable in lower gears.
  • Solution: In some cases, a software update might resolve the issue. In other cases, valve body issues may be the cause and require repair or replacement. A transmission fluid service may improve the shifting.
  • Estimated Cost to Fix: $150 (Fluid Service) - $2,000+ (Valve Body Replacement)
  • Recalls: None Found
• Delayed Engagement
  • Description/Symptoms: A noticeable delay between shifting gears (e.g., from Park to Drive or Reverse) and actual movement.
  • Solution: Often caused by low transmission fluid or internal wear. A transmission fluid service and inspection are recommended. More severe cases may require transmission rebuild or replacement.
  • Estimated Cost to Fix: $150 (Fluid Service) - $4,000+ (Transmission Replacement)
  • Recalls: None Found

Suspension

• Noises from Suspension Components
  • Description/Symptoms: Clunking or rattling noises, especially when driving over bumps or uneven surfaces. This could indicate worn-out control arm bushings, sway bar links, or struts.
  • Solution: Replace the worn suspension components.
  • Estimated Cost to Fix: $150 - $500+ per corner, depending on the specific component.
  • Recalls: None Found

Electrical

• Battery Drain Issues
  • Description/Symptoms: Premature battery drain, leading to difficulty starting the vehicle or requiring frequent jump starts. Could be caused by a parasitic drain from a faulty module or accessory.
  • Solution: Diagnose and repair the source of the parasitic drain. This may involve replacing a faulty module, repairing wiring, or addressing aftermarket accessory issues.
  • Estimated Cost to Fix: $100 - $500+ depending on the complexity of the electrical issue.
  • Recalls: None Found
• iDrive System Glitches
  • Description/Symptoms: Infotainment system (iDrive) malfunctions, such as freezing, crashing, or displaying incorrect information.
  • Solution: Software updates may resolve some glitches. In more severe cases, the iDrive module may need to be replaced.
  • Estimated Cost to Fix: $0 (Software Update) - $1,000+ (Module Replacement)
  • Recalls: None Found

Exterior

• No Issues Found

Interior

• Rattling Interior Trim
  • Description/Symptoms: Rattling noises coming from various interior trim pieces, particularly in the dashboard or door panels.
  • Solution: Secure or replace loose trim pieces. Apply sound-deadening material to reduce vibrations.
  • Estimated Cost to Fix: $50 - $200+ depending on the severity and location of the rattle.
  • Recalls: None Found

Summary

The 2018 BMW 120i is a generally reliable vehicle, but like many modern cars, it can be susceptible to certain issues. Engine oil and coolant leaks are relatively common and can lead to costly repairs if left unattended. Transmission issues, particularly rough shifting, can also be a concern. Electrical problems such as battery drain and iDrive glitches can be frustrating, but often have relatively straightforward solutions. The severity and cost of these issues can vary greatly depending on the specific problem and the extent of the damage. Pre-purchase inspections and regular maintenance are essential to minimize potential issues and keep the 2018 BMW 120i running smoothly.