2015 BMW M135i

The 2015 BMW M135i is a performance-oriented hatchback that offers a blend of practicality and driving fun. It was available with a 3.0-liter turbocharged inline-six engine, producing 320 horsepower and 332 lb-ft of torque. A rear-wheel-drive layout provides the signature BMW driving experience. Gearbox options include a 6-speed manual and an 8-speed automatic transmission. Owners typically praise the car’s powerful engine, sharp handling, and relatively compact size, making it enjoyable in various driving conditions. Common dislikes include the firm ride quality, particularly on rough roads, and the sometimes-costly maintenance associated with BMW ownership.

Engine

3.0L Turbocharged Inline-Six (N55B30)

• Oil Filter Housing Gasket Leak
  • Description/Symptoms: Oil leak from the oil filter housing, resulting in a burning oil smell and potential oil loss. Visible oil residue around the housing.
  • Solution: Replacement of the oil filter housing gasket.
  • Estimated Cost to Fix: $300 - $500
  • Recalls: None Found
• VANOS Solenoid Failure
  • Description/Symptoms: Rough idling, decreased engine performance, and potential error codes related to the VANOS system.
  • Solution: Replacement of the faulty VANOS solenoid(s).
  • Estimated Cost to Fix: $300 - $600
  • Recalls: None Found

Transmission

6-Speed Manual

No Issues Found

8-Speed Automatic (ZF 8HP45)

• Mechatronic Unit Failure
  • Description/Symptoms: Harsh shifting, delayed engagement, slipping between gears, and potential transmission malfunction warnings.
  • Solution: Replacement or rebuild of the mechatronic unit. Sometimes a software flash will resolve the issue.
  • Estimated Cost to Fix: $1500 - $4000+
  • Recalls: None Found

Suspension

• Cracked Springs
  • Description/Symptoms: Most commonly the rear springs cracking, especially in areas with heavily salted winter roads. Can result in a clunking noise.
  • Solution: Spring replacement.
  • Estimated Cost to Fix: $400-800
  • Recalls: None Found

Electrical

• Battery Drain
  • Description/Symptoms: The car battery drains quickly, especially if the car sits for extended periods of time.
  • Solution: Diagnose the parasitic drain. Can be caused by faulty modules that don’t shut down when the car is off, or aftermarket electronics installed incorrectly.
  • Estimated Cost to Fix: $100 - $500+
  • Recalls: None Found

Exterior

• Rear Tail Light LED Failure
  • Description/Symptoms: One or more of the LEDs on the rear tail light will fail, which can result in a bulb-out warning.
  • Solution: Replace the tail light assembly.
  • Estimated Cost to Fix: $300-$500
  • Recalls: None Found

Interior

• iDrive Screen Failure
  • Description/Symptoms: The iDrive screen can experience flickering, dimming, or complete failure.
  • Solution: Replacement of the iDrive screen or the iDrive module itself.
  • Estimated Cost to Fix: $500 - $1500
  • Recalls: None Found

Summary

The 2015 BMW M135i, while offering a thrilling driving experience, is prone to a few common issues. Engine issues such as oil leaks and VANOS problems are relatively common, but may be relatively inexpensive depending on the location. The automatic transmission can suffer from costly mechatronic failures. Electrical and interior issues involving the iDrive system and battery drain can also require attention. While the M135i’s strengths lie in its performance and handling, potential buyers should be aware of these potential maintenance costs and issues.