2012 BMW 128i

The 2012 BMW 128i is a well-regarded compact coupe and convertible praised for its engaging driving dynamics, classic BMW styling, and relatively simple, reliable design compared to its turbocharged counterparts. The 128i comes equipped with a naturally aspirated 3.0-liter inline-6 engine (N52B30) producing 230 horsepower and 200 lb-ft of torque. It was available with either a 6-speed manual or a 6-speed automatic transmission. Owners generally appreciate the car’s balanced handling, smooth engine, and comfortable ride. However, some common complaints include the cost of maintenance and repairs, potential for oil leaks, and some electrical issues.

Engine

N52B30 3.0L Inline-6

• Valve Cover Gasket Leaks
  • Description/Symptoms: Oil leaking onto the exhaust manifold, resulting in a burning oil smell. Visible oil around the valve cover gasket area.
  • Solution: Replace the valve cover gasket and potentially the valve cover itself, as the plastic can warp over time.
  • Estimated Cost to Fix: $300 - $700+
  • Recalls: None Found
• Oil Filter Housing Gasket Leak
  • Description/Symptoms: Oil leaking from the oil filter housing, often dripping down the side of the engine.
  • Solution: Replace the oil filter housing gasket.
  • Estimated Cost to Fix: $200 - $500+
  • Recalls: None Found
• VANOS Solenoid Issues
  • Description/Symptoms: Rough idle, decreased performance, and possible check engine light with VANOS-related codes.
  • Solution: Clean or replace the VANOS solenoids.
  • Estimated Cost to Fix: $100 - $400+
  • Recalls: None Found
• Eccentric Shaft Sensor Failure
  • Description/Symptoms: Rough idle, stalling, reduced power, and a check engine light.
  • Solution: Replace the eccentric shaft sensor.
  • Estimated Cost to Fix: $500 - $1200+
  • Recalls: None Found

Transmission

6-Speed Automatic (GM GA6L45R)

• Valve Body Issues
  • Description/Symptoms: Harsh shifting, slipping between gears, delayed engagement, or failure to shift.
  • Solution: Replace the valve body, or in some cases, rebuild the transmission.
  • Estimated Cost to Fix: $800 - $4000+
  • Recalls: None Found

6-Speed Manual (GS6-17BG/DG) *No Issues Found

Suspension

• Cracked Front Control Arm Bushings
  • Description/Symptoms: Clunking noise from the front suspension, especially when going over bumps. Vague steering.
  • Solution: Replace the front control arm bushings or the entire control arm.
  • Estimated Cost to Fix: $200 - $600+
  • Recalls: None Found
• Rear Subframe Bushings
  • Description/Symptoms: Clunking noise from the rear suspension, especially when accelerating or decelerating. Vague handling.
  • Solution: Replace the rear subframe bushings.
  • Estimated Cost to Fix: $400 - $1000+
  • Recalls: None Found

Electrical

• Battery Drain
  • Description/Symptoms: The battery drains quickly, especially when the car is not driven frequently.
  • Solution: Diagnose and repair the source of the parasitic draw. Common culprits include faulty modules, aftermarket accessories, or a failing alternator.
  • Estimated Cost to Fix: $100 - $500+ (Diagnosis and repair vary greatly)
  • Recalls: None Found
• Window Regulator Failure
  • Description/Symptoms: The window moves slowly or not at all. Grinding noises from inside the door panel.
  • Solution: Replace the window regulator.
  • Estimated Cost to Fix: $200 - $500+
  • Recalls: None Found
• FRM (Footwell Module) Failure
  • Description/Symptoms: Loss of power windows, exterior lighting issues, or other electrical malfunctions.
  • Solution: Re-program or replace the FRM module.
  • Estimated Cost to Fix: $300 - $1000+
  • Recalls: None Found

Exterior

• Convertible Top Issues (Convertible Models Only)
  • Description/Symptoms: The convertible top may fail to open or close correctly. Issues with the hydraulic system.
  • Solution: Diagnose the cause of the top malfunction and repair or replace the faulty component. This may involve the hydraulic pump, hoses, or sensors.
  • Estimated Cost to Fix: $500 - $2000+
  • Recalls: None Found

Interior

• No Issues Found

Summary

The 2012 BMW 128i is a generally reliable vehicle, but owners should be aware of potential issues like oil leaks from the valve cover and oil filter housing gaskets. Automatic transmission issues, especially with the valve body, can be expensive to repair. Electrical problems such as battery drain and FRM module failure can also occur. While some of the issues can be costly to address, the 128i remains a desirable car for its driving experience and relatively straightforward design compared to its more complex turbocharged siblings. The severity of these issues can range from minor inconveniences to major repairs, with costs varying accordingly.