2017 BMW 340i

The 2017 BMW 340i is a popular sports sedan known for its blend of performance and luxury. The standard engine is the turbocharged 3.0-liter inline-six (B58) producing 320 horsepower and 330 lb-ft of torque. Other engine options for the 2017 3 Series lineup include a 2.0-liter turbocharged four-cylinder in the 320i and 330i models. Transmission options include a 6-speed manual and an 8-speed automatic. Owners often praise the 340i for its smooth and powerful engine, sharp handling, and comfortable interior. Common complaints revolve around reliability concerns, particularly with electrical components, and the cost of maintenance.

Engine

B58 3.0-Liter Inline-Six (340i)

• Oil Filter Housing Gasket Leak
  • Description/Symptoms: Oil leak originating from the oil filter housing. Noticeable oil drips on the ground, burning oil smell, and low oil level warnings.
  • Solution: Replace the oil filter housing gasket.
  • Estimated Cost to Fix: $300 - $500+
  • Recalls: None Found
• Coolant Leaks
  • Description/Symptoms: Coolant leaks can originate from various points in the cooling system, including the water pump, radiator hoses, and expansion tank. Symptoms include low coolant levels, overheating, and visible coolant leaks under the vehicle.
  • Solution: Identify and replace the leaking component. This could involve replacing hoses, the water pump, or the expansion tank.
  • Estimated Cost to Fix: $200 - $800+ depending on the component.
  • Recalls: None Found

Transmission

ZF 8HP 8-Speed Automatic

• Mechatronic Unit Issues
  • Description/Symptoms: The mechatronic unit, which controls the transmission’s shifting, can experience internal failures. Symptoms include harsh shifting, delayed engagement, and transmission slipping.
  • Solution: Replacement of the mechatronic unit or, in some cases, the entire transmission.
  • Estimated Cost to Fix: $2,000 - $6,000+ depending on the repair.
  • Recalls: None Found
• Rough Shifting
  • Description/Symptoms: Hesitation and rough shifts between gears
  • Solution: Replace transmission fluid, reset transmission adaptations, or replace the transmission.
  • Estimated Cost to Fix: $100 - $6,000+ depending on the repair.
  • Recalls: None Found

Suspension

• Cracking Suspension Components
  • Description/Symptoms: Suspension components can crack and degrade leading to creaking noises and poor handling.
  • Solution: Replacing of the suspension arms and bushings.
  • Estimated Cost to Fix: $500 - $2,000+
  • Recalls: None Found

Electrical

• VANOS Solenoid Failure
  • Description/Symptoms: Engine performance issues, including rough idle, decreased power, and potential check engine light. Fault codes related to the VANOS system.
  • Solution: Replace faulty VANOS solenoid(s).
  • Estimated Cost to Fix: $200 - $600+
  • Recalls: None Found
• iDrive System Issues
  • Description/Symptoms: The iDrive infotainment system can experience glitches, freezing, and software malfunctions.
  • Solution: Software updates or replacement of the iDrive controller.
  • Estimated Cost to Fix: $100 - $1,200+
  • Recalls: None Found
• Tail Light Failures
  • Description/Symptoms: Rear tail lights flickering and shorting.
  • Solution: Replacement of the rear tail light assembly.
  • Estimated Cost to Fix: $200 - $400+
  • Recalls: None Found

Exterior

• Door Handle LED Failure
  • Description/Symptoms: The LED lights embedded in the exterior door handles can fail.
  • Solution: Replacement of the door handle assembly.
  • Estimated Cost to Fix: $300 - $600+ per handle.
  • Recalls: None Found

Interior

• Sunroof Issues
  • Description/Symptoms: Sunroof may not open or close completely.
  • Solution: Inspect and lubricate the sunroof tracks or replace sunroof motor.
  • Estimated Cost to Fix: $100 - $1,000+
  • Recalls: None Found

Summary

The 2017 BMW 340i, while praised for its performance and driving dynamics, can suffer from a range of issues. Engine oil leaks, coolant leaks and electrical problems are common, with the iDrive system and tail lights being frequent offenders. Transmission issues like rough shifting are also reported. While some repairs are relatively inexpensive, others, particularly those involving the transmission or iDrive system, can be quite costly. Overall, the 2017 BMW 340i can be a rewarding car to own, but potential buyers should be aware of the potential reliability issues and budget accordingly for maintenance and repairs.