2010 BMW 135i

Introduction

The 2010 BMW 135i is a performance-oriented coupe powered by a twin-turbocharged 3.0-liter inline-six engine producing 300 horsepower and 300 lb-ft of torque. It comes standard with a six-speed manual transmission, but a six-speed automatic transmission is available as an option. The 135i is praised for its agile handling, responsive engine, and luxurious interior. However, it has faced some reliability issues over the years.

Engine

3.0L Twin-Turbocharged Inline-Six

• Wastegate Rattle:
  • Description/Symptoms: A rattling noise coming from the engine bay under acceleration or high boost pressure.
  • Solution: Replace the wastegate actuator.
  • Estimated Cost to Fix: $500 - $800+
  • Recalls: None Found
• High-Pressure Fuel Pump Failure:
  • Description/Symptoms: Engine stalling or misfiring, difficulty starting, reduced power output.
  • Solution: Replace the high-pressure fuel pump.
  • Estimated Cost to Fix: $1,000 - $1,500+
  • Recalls: #10V402000
• Carbon Buildup on Intake Valves:
  • Description/Symptoms: Reduced engine power, hesitation or misfires, rough idle.
  • Solution: Clean or replace the intake valves.
  • Estimated Cost to Fix: $500 - $1,000+
  • Recalls: None Found

Transmission

Six-Speed Manual

• Clutch Slipping:
  • Description/Symptoms: Engine revving without corresponding increase in speed, difficulty engaging gears.
  • Solution: Replace the clutch assembly.
  • Estimated Cost to Fix: $1,000 - $1,500+
  • Recalls: None Found

Six-Speed Automatic

• Transmission Solenoid Failure:
  • Description/Symptoms: Harsh gear shifts, delayed engagement, slipping gears.
  • Solution: Replace the transmission solenoid pack.
  • Estimated Cost to Fix: $1,500 - $2,000+
  • Recalls: None Found

Suspension

• Strut Mount Bearing Failure:
  • Description/Symptoms: Knocking or clunking noises from the front suspension, vibration through the steering wheel.
  • Solution: Replace the strut mount bearings.
  • Estimated Cost to Fix: $500 - $800+
  • Recalls: None Found

Electrical

• Battery Discharge:
  • Description/Symptoms: Battery drains quickly, difficulty starting the car.
  • Solution: Identify and fix the electrical draw causing the discharge.
  • Estimated Cost to Fix: $200 - $500+
  • Recalls: #10V411000

Exterior

• Headlight Condensation:
  • Description/Symptoms: Moisture accumulates inside the headlight assemblies.
  • Solution: Replace the affected headlights.
  • Estimated Cost to Fix: $500 - $1,000+ per headlight
  • Recalls: #14V262000

Interior

• Navigation Screen Failure:
  • Description/Symptoms: Screen becomes unresponsive or displays distorted images.
  • Solution: Replace the navigation system unit.
  • Estimated Cost to Fix: $1,000 - $1,500+
  • Recalls: None Found
• Power Window Failure:
  • Description/Symptoms: Windows become inoperable or function erratically.
  • Solution: Replace the affected window motor or switch.
  • Estimated Cost to Fix: $300 - $600+ per window
  • Recalls: None Found

Summary

The 2010 BMW 135i is a highly regarded performance car, but it has not been immune to reliability issues. Some of the more significant problems include wastegate rattle, high-pressure fuel pump failures, and carbon buildup on intake valves. The transmission, suspension, electrical system, exterior, and interior have also experienced some concerns. While the severity and cost of these issues can vary, it’s important to be aware of them before purchasing or owning a 135i.