2007 BMW 335i

The 2007 BMW 335i is a popular sports sedan known for its engaging driving dynamics and powerful engine. The most common engine option is the N54 3.0-liter twin-turbocharged inline-six, producing 300 horsepower and 300 lb-ft of torque. While a desirable car, the 2007 335i is known for some reliability issues. Owners praise its performance and handling, but common complaints include problems with the fuel system, turbochargers, and cooling system, leading to potentially high maintenance costs. Available transmissions included a 6-speed manual and a 6-speed automatic.

Engine

N54 3.0L Twin-Turbo Inline-Six

• High-Pressure Fuel Pump (HPFP) Failure
  • Description/Symptoms: Long cranking times, especially when cold, rough idling, and potential engine stalling. Can trigger a check engine light.
  • Solution: Replace the faulty HPFP. Several revisions have been made to this pump, but issues can still arise.
  • Estimated Cost to Fix: $700 - $1200+
  • Recalls: None Found
• Turbocharger Wastegate Rattle/Failure
  • Description/Symptoms: Rattling noise from the rear of the engine, especially at low RPMs or when decelerating. Reduced boost pressure or complete turbocharger failure can also occur.
  • Solution: Replace the turbochargers or, in some cases, the wastegate actuators.
  • Estimated Cost to Fix: $2000 - $5000+ (for turbocharger replacement)
  • Recalls: None Found
• Fuel Injector Failure
  • Description/Symptoms: Rough idle, misfires, and a decrease in fuel efficiency. Often accompanied by a check engine light.
  • Solution: Replace the faulty fuel injectors.
  • Estimated Cost to Fix: $200 - $400+ per injector (labor included)
  • Recalls: None Found
• Oil Leaks (Valve Cover Gasket, Oil Filter Housing Gasket)
  • Description/Symptoms: Visible oil leaks on the engine, burning oil smell, and low oil level.
  • Solution: Replace the leaking gaskets.
  • Estimated Cost to Fix: $300 - $600 (per gasket replacement, labor included)
  • Recalls: None Found
• Carbon Buildup on Intake Valves
  • Description/Symptoms: Rough idle, reduced power, and poor fuel economy. Common in direct-injection engines.
  • Solution: Clean the intake valves using walnut blasting or chemical cleaning.
  • Estimated Cost to Fix: $400 - $800+
  • Recalls: None Found
• Water Pump Failure
  • Description/Symptoms: Overheating, coolant leaks, and a warning light on the dashboard.
  • Solution: Replace the electric water pump and thermostat.
  • Estimated Cost to Fix: $600 - $1000+
  • Recalls: None Found

Transmission

6-Speed Automatic

• Mechatronic Sleeve Leak
  • Description/Symptoms: Transmission fluid leak, rough shifting, and transmission malfunction warnings.
  • Solution: Replace the mechatronic sleeve and potentially service the transmission.
  • Estimated Cost to Fix: $400 - $800+
  • Recalls: None Found
• Valve Body Issues
  • Description/Symptoms: Harsh or delayed shifting, slipping, or failure to shift.
  • Solution: Replace or rebuild the valve body.
  • Estimated Cost to Fix: $800 - $2000+
  • Recalls: None Found

Suspension

• Control Arm Bushing Failure
  • Description/Symptoms: Clunking noises from the front suspension, especially when going over bumps, and vague steering.
  • Solution: Replace the control arm bushings or the entire control arm.
  • Estimated Cost to Fix: $300 - $800+
  • Recalls: None Found

Electrical

• Battery Drain
  • Description/Symptoms: Dead battery, requiring frequent jump starts.
  • Solution: Diagnose and repair the source of the parasitic drain, which could be a faulty module or aftermarket accessory.
  • Estimated Cost to Fix: $100 - $500+ (depending on the source of the drain)
  • Recalls: None Found
• Comfort Access Issues
  • Description/Symptoms: The comfort access system (keyless entry and start) may become intermittent or stop working entirely.
  • Solution: Diagnose and repair the comfort access module, door handle sensors, or wiring.
  • Estimated Cost to Fix: $200 - $800+
  • Recalls: None Found

Exterior

• Cracked Taillight Lenses
  • Description/Symptoms: Cracks in the plastic taillight lenses, leading to moisture intrusion.
  • Solution: Replace the taillight assembly.
  • Estimated Cost to Fix: $150 - $400+ per taillight.
  • Recalls: None Found

Interior

• Sticking Sunroof
  • Description/Symptoms: Sunroof gets stuck open or closed.
  • Solution: Clean the sunroof tracks and lubricate the mechanism.
  • Estimated Cost to Fix: $100 - $300+ (if cleaning and lubrication are sufficient)
  • Recalls: None Found

Summary

The 2007 BMW 335i offers a thrilling driving experience but comes with a higher risk of maintenance issues, especially concerning the engine and fuel system. The HPFP, turbochargers, and fuel injectors are known weak points, and repairs can be costly. Suspension and electrical issues can also arise. Prospective buyers should be aware of these potential problems and factor in the cost of repairs when considering this vehicle. Regular maintenance and a thorough pre-purchase inspection are crucial to mitigating these risks. The severity of the issues ranges from annoying (sunroof) to potentially catastrophic (engine or turbo failure), and the cost can range from a few hundred dollars to several thousand.