2020 BMW M135i

Here is a comprehensive list of common issues and complaints reported by owners of the 2020 BMW M135i, categorized by major components.

The 2020 BMW M135i is a performance-oriented hatchback known for its sporty handling and powerful engine. It’s equipped with a 2.0-liter turbocharged four-cylinder engine producing 302 horsepower and 332 lb-ft of torque. All-wheel drive (xDrive) is standard. Some owners praise its acceleration, agility, and overall driving experience. Common complaints revolve around ride harshness, especially on models with larger wheels and sport suspension, and some find the interior lacking compared to other luxury brands. A DCT transmission is used for this car.

Engine

2.0L Turbocharged Four-Cylinder (B48)

• Coolant Loss
  • Description/Symptoms: Coolant level drops frequently, requiring top-ups. Visible coolant leaks may be present. Overheating may occur in severe cases.
  • Solution: Pressure test the cooling system to identify leaks. Replace any leaking hoses, radiator, expansion tank, or water pump. The plastic coolant pipes may crack and cause a leak, in which case the coolant pipes need to be replaced.
  • Estimated Cost to Fix: $100 - $1000+ (depending on the component needing replacement)
  • Recalls: None Found
• Engine Oil Consumption
  • Description/Symptoms: Excessive engine oil consumption. The oil level drops faster than expected between oil changes. Visible blue smoke from the exhaust may be present.
  • Solution: Perform a compression test and leak-down test to check the condition of piston rings and valve stem seals. If these components are worn, an engine rebuild or replacement may be necessary.
  • Estimated Cost to Fix: $500 - $7000+ (depending on severity and repair method)
  • Recalls: None Found

Transmission

8-Speed Automatic (Aisin)

• Rough Shifting
  • Description/Symptoms: Harsh or jerky shifts, especially between lower gears. May be more noticeable when the transmission is cold.
  • Solution: Perform a transmission fluid flush and filter change. If the issue persists, the valve body may need to be inspected and rebuilt or replaced.
  • Estimated Cost to Fix: $300 - $3000+ (depending on the repair)
  • Recalls: None Found
• Delayed Engagement
  • Description/Symptoms: A noticeable delay between shifting into drive or reverse and the vehicle actually moving.
  • Solution: Check the transmission fluid level and condition. Low fluid or contaminated fluid can cause this issue. If the fluid is good, internal transmission damage may be present, requiring a rebuild or replacement.
  • Estimated Cost to Fix: $100 - $4500+
  • Recalls: None Found

Suspension

• Ride Harshness
  • Description/Symptoms: A firm or uncomfortable ride, especially on rough roads. May be exacerbated by the optional sport suspension and larger wheels.
  • Solution: Check tire pressures and ensure they are within the recommended range. Consider replacing run-flat tires with conventional tires for a more compliant ride. Aftermarket dampers can also be installed to improve the ride quality.
  • Estimated Cost to Fix: $50 - $3000+ (depending on selected solution)
  • Recalls: None Found
• Creaking or Squeaking Noises
  • Description/Symptoms: Creaking or squeaking noises coming from the suspension, especially when going over bumps or turning.
  • Solution: Inspect the suspension components for worn or damaged bushings, ball joints, and sway bar links. Replace any worn parts.
  • Estimated Cost to Fix: $100 - $800+ (depending on the component needing replacement)
  • Recalls: None Found

Electrical

• Infotainment System Glitches
  • Description/Symptoms: The infotainment system may freeze, crash, or exhibit other glitches.
  • Solution: Perform a system reset. Update the infotainment software to the latest version. In severe cases, the infotainment unit may need to be replaced.
  • Estimated Cost to Fix: $0 - $2000+ (depending on the repair)
  • Recalls: None Found
• Sensor Malfunctions
  • Description/Symptoms: Malfunctioning sensors, such as parking sensors or tire pressure monitoring sensors (TPMS), may cause warning lights to illuminate on the dashboard.
  • Solution: Diagnose the specific sensor that is malfunctioning. Replace the faulty sensor.
  • Estimated Cost to Fix: $100 - $500+ (depending on the sensor)
  • Recalls: None Found

Exterior

• No Issues Found

Interior

• Rattling Noises
  • Description/Symptoms: Rattling noises coming from the dashboard, door panels, or other interior trim pieces.
  • Solution: Locate the source of the rattle and apply foam padding or felt to eliminate the noise.
  • Estimated Cost to Fix: $0 - $200+ (DIY or professional repair)
  • Recalls: None Found

Summary

The 2020 BMW M135i has some common issues reported by owners, including coolant loss, engine oil consumption, and rough shifting. Suspension and electrical issues have also been reported. The severity of the issues varies, and the cost to repair can range from a few hundred dollars to several thousand dollars, depending on the specific problem.