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2012 BMW 328i

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By Research the Car 4 min read

The 2012 BMW 328i (F30 chassis) is a popular luxury sport sedan known for its blend of performance and comfort. The most common engine option is a 2.0L turbocharged inline-4 cylinder (N20) producing 240 horsepower and 260 lb-ft of torque. Other engine options for this year include a 3.0L inline-6 cylinder (N55) available in the 335i model, which is not the focus of this response. Available transmissions include a 6-speed manual and an 8-speed automatic. People generally appreciate the 328i’s engaging driving dynamics, stylish interior, and fuel efficiency. Common complaints revolve around reliability issues, particularly with the N20 engine, and higher maintenance costs compared to non-luxury vehicles.

Engine

2.0L Turbocharged Inline-4 (N20)

  • Timing Chain Failure
    • Description/Symptoms: The timing chain can stretch or break prematurely, leading to engine damage. Symptoms include a rattling noise upon start-up (especially when cold), rough idling, check engine light, and potential engine failure.
    • Solution: Replace the timing chain, guides, and tensioner. It is recommended to use updated parts designed to address the original design flaws.
    • Estimated Cost to Fix: $1,500 - $3,000+
    • Recalls: None Found
  • Oil Leaks (Valve Cover Gasket, Oil Filter Housing Gasket, Oil Pan Gasket)
    • Description/Symptoms: Oil leaks are common as the gaskets age and deteriorate. Symptoms include visible oil leaks on the engine, burning oil smell, and low oil levels.
    • Solution: Replace the leaking gaskets.
    • Estimated Cost to Fix: Valve Cover Gasket: $300 - $600, Oil Filter Housing Gasket: $400 - $800, Oil Pan Gasket: $800 - $1500+
    • Recalls: None Found
  • Coolant Leaks (Water Pump, Thermostat Housing)
    • Description/Symptoms: Coolant leaks can occur due to plastic components becoming brittle over time. Symptoms include low coolant levels, overheating, and visible coolant leaks.
    • Solution: Replace the faulty water pump or thermostat housing.
    • Estimated Cost to Fix: Water Pump: $600 - $1200, Thermostat Housing: $300 - $700
    • Recalls: None Found

Transmission

8-Speed Automatic (GA8HP45Z)

  • Rough Shifting/Hesitation
    • Description/Symptoms: Some owners report experiencing rough or delayed shifts, especially when cold. This can be caused by mechatronic unit issues or worn valve bodies.
    • Solution: Perform a transmission fluid flush and filter replacement. If the problem persists, the mechatronic unit or valve body may need to be rebuilt or replaced.
    • Estimated Cost to Fix: Fluid Flush/Filter: $300 - $500, Mechatronic Unit/Valve Body: $1,500 - $3,500+
    • Recalls: None Found

Suspension

  • Control Arm Bushing Failure
    • Description/Symptoms: Worn control arm bushings can cause clunking noises, especially when going over bumps. It can also cause vague steering and uneven tire wear.
    • Solution: Replace the worn control arm bushings or the entire control arm assembly.
    • Estimated Cost to Fix: $300 - $800 per side
    • Recalls: None Found
  • Strut/Shock Absorber Failure
    • Description/Symptoms: Leaking struts or shocks result in a bouncy ride, poor handling, and reduced braking performance.
    • Solution: Replace the faulty struts or shocks.
    • Estimated Cost to Fix: $400 - $1000 per corner
    • Recalls: None Found

Electrical

  • Battery Drain Issues
    • Description/Symptoms: Premature battery drain can occur due to faulty sensors, modules not shutting down properly, or other electrical issues. This can result in difficulty starting the car or a completely dead battery.
    • Solution: Diagnose and repair the source of the battery drain. This may involve replacing a faulty sensor, module, or wiring harness.
    • Estimated Cost to Fix: $100 - $1000+ (depending on the cause)
    • Recalls: None Found
  • Faulty Window Regulators
    • Description/Symptoms: The window regulator can fail, causing the window to become stuck or move erratically.
    • Solution: Replace the faulty window regulator.
    • Estimated Cost to Fix: $300 - $600 per window
    • Recalls: None Found

Exterior

  • Cracked Plastic Trim Pieces
    • Description/Symptoms: Some exterior plastic trim pieces, such as around the windows or bumpers, can become brittle and crack over time, especially in areas with high sun exposure.
    • Solution: Replace the cracked trim pieces.
    • Estimated Cost to Fix: $100 - $500+ (depending on the piece)
    • Recalls: None Found

Interior

  • Sticking iDrive Screen
    • Description/Symptoms: The iDrive screen can sometimes stick or fail to retract properly, usually caused by wear and tear of the motor.
    • Solution: Replace or repair the iDrive screen motor mechanism.
    • Estimated Cost to Fix: $200-$800
    • Recalls: None Found
  • Malfunctioning Sunroof
    • Description/Symptoms: Sunroofs can experience issues with opening, closing, or leaking. This can be due to a faulty motor, damaged seals, or a clogged drain.
    • Solution: Diagnose and repair the cause of the malfunction. This may involve replacing the motor, seals, or cleaning the drain.
    • Estimated Cost to Fix: $200 - $1000+ (depending on the cause)
    • Recalls: None Found

Summary

The 2012 BMW 328i, while a desirable vehicle, has some common issues that potential buyers should be aware of. The most significant concern revolves around the N20 engine’s timing chain and oil leaks, which can be costly to repair. Other issues, such as suspension problems and electrical quirks, can also contribute to the overall cost of ownership. While the severity of these issues varies, it is crucial to have the vehicle inspected by a qualified mechanic before purchase and to factor in potential maintenance costs when considering a 2012 BMW 328i.

BMW, 328i
BMW 328i 2012
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