2010 BMW 335i

The 2010 BMW 335i is a popular sports sedan known for its engaging driving dynamics and luxurious features. It came with several engine options, including the turbocharged 3.0-liter N54 inline-six, producing 300 horsepower and 300 lb-ft of torque, and the naturally aspirated 3.0-liter N52 inline-six, producing 230 horsepower and 200 lb-ft of torque. Transmission options included a 6-speed manual and a 6-speed automatic. Owners often praise the car’s handling, powerful engine (especially the N54), and stylish design. Common complaints revolve around maintenance costs, reliability issues, and the complexity of the electronics.

Engine

N54 3.0L Turbocharged Inline-Six

• High-Pressure Fuel Pump (HPFP) Failure
  • Description/Symptoms: Long cranking times, rough idling, engine stalling, and a potential limp mode. The car may throw codes related to fuel pressure.
  • Solution: Replace the HPFP with an updated version.
  • Estimated Cost to Fix: $800 - $1200+
  • Recalls: None Found
• Wastegate Rattle
  • Description/Symptoms: A metallic rattling noise from the turbochargers, especially during partial throttle or deceleration. This is due to worn wastegate bushings.
  • Solution: Replace the turbochargers or rebuild them with upgraded wastegate components.
  • Estimated Cost to Fix: $1500 - $4000+
  • 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 valve cover gasket and/or the oil filter housing gasket.
  • Estimated Cost to Fix: Valve Cover Gasket: $400 - $800+, Oil Filter Housing Gasket: $300 - $600+
  • Recalls: None Found
• Fuel Injector Issues
  • Description/Symptoms: Rough idle, misfires, poor fuel economy, and potential catalytic converter damage.
  • Solution: Replace faulty fuel injectors. It’s often recommended to replace all injectors at the same time to ensure balanced performance.
  • Estimated Cost to Fix: $200 - $500+ per injector
  • Recalls: None Found

N52 3.0L Naturally Aspirated Inline-Six

• 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 valve cover gasket and/or the oil filter housing gasket.
  • Estimated Cost to Fix: Valve Cover Gasket: $400 - $800+, Oil Filter Housing Gasket: $300 - $600+
  • Recalls: None Found
• VANOS Solenoid Issues
  • Description/Symptoms: Reduced power, rough idle, and potential engine stalling.
  • Solution: Clean or replace the VANOS solenoids.
  • Estimated Cost to Fix: $200 - $500+
  • Recalls: None Found

Transmission

6-Speed Automatic

• Mechatronic Sleeve Leak
  • Description/Symptoms: Transmission fluid leak, often resulting in poor shifting, delayed engagement, or transmission malfunction.
  • Solution: Replace the mechatronic sleeve. This requires dropping the transmission pan and replacing the sleeve where the wiring harness connects to the transmission. It is often recommended to service the transmission at the same time, including a fluid and filter change.
  • Estimated Cost to Fix: $500 - $1000+
  • Recalls: None Found
• Torque Converter Failure
  • Description/Symptoms: Shuddering during gear changes, vibrations, and potential transmission failure.
  • Solution: Replace the torque converter.
  • Estimated Cost to Fix: $1500 - $3000+
  • Recalls: None Found

6-Speed Manual

No Issues Found

Suspension

• Control Arm Bushing Wear
  • Description/Symptoms: Clunking noises from the front suspension, especially over bumps, and vague steering feel.
  • Solution: Replace the worn control arm bushings or the entire control arm.
  • Estimated Cost to Fix: Bushings: $200 - $400+, Control Arms: $400 - $800+
  • Recalls: None Found
• Damper Failure
  • Description/Symptoms: Bouncy ride, poor handling, and visible leaks from the shock absorbers.
  • Solution: Replace the dampers.
  • Estimated Cost to Fix: $400 - $1000+
  • Recalls: None Found

Electrical

• Battery Drain Issues
  • Description/Symptoms: Dead battery, even after short periods of inactivity.
  • Solution: Diagnose and repair the source of the parasitic drain. This could be a faulty module or aftermarket accessory.
  • Estimated Cost to Fix: $100 - $500+ (depending on the source of the drain)
  • Recalls: None Found
• Door Lock Actuator Failure
  • Description/Symptoms: Door lock failing to open or close.
  • Solution: Replace the faulty door lock actuator.
  • Estimated Cost to Fix: $200 - $400+
  • Recalls: None Found

Exterior

• Sunroof Issues
  • Description/Symptoms: Sunroof not opening or closing properly, getting stuck, or making excessive noise.
  • Solution: Lubricate the sunroof tracks or replace faulty components, such as the motor or regulator.
  • Estimated Cost to Fix: $100 - $600+
  • Recalls: None Found

Interior

• Sticking iDrive Controller
  • Description/Symptoms: The iDrive controller knob sticks or is difficult to move.
  • Solution: Replace the iDrive controller or attempt to lubricate it.
  • Estimated Cost to Fix: $100 - $400+
  • Recalls: None Found

Summary

The 2010 BMW 335i is a desirable vehicle, but potential buyers should be aware of common issues. The N54 engine, while powerful, is prone to HPFP failures, wastegate rattle, and oil leaks. The automatic transmission can suffer from mechatronic sleeve leaks. Suspension issues are typical with age. Electrical issues are fairly common due to the complex electronics of the car. Repair costs can be significant, particularly for engine and transmission-related problems, making it important to thoroughly inspect any prospective purchase and budget for potential maintenance.