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2018 BMW 340iProblems, recalls & complaints

NHTSA has logged 3 owner complaints about the 2018 BMW 340i, most often about the engine. It is covered by 1 safety recall, and for recall 18V-465 the manufacturer reports only 98% of affected cars repaired.

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CarFlaw IndexNot enough dataHigher is better (0–100)
Safety recalls1Lowest repair rate 98%Owner complaints31 with a crash, fire or injuryTypical failure mileage20kEngine, median miles

Source: NHTSA complaints, recalls, investigations and manufacturer recall reports, through October 26, 2023. Updated daily.

Complaints by system

Where the 2018 BMW 340i has problems

3 complaints grouped by the system owners reported.

Box size = number of complaints naming that system. Darker = larger share. One complaint can name more than one system.
Complaints by system
SystemComplaintsCrash, fire or injury
Engine21
Fuel/propulsion system10

Source: NHTSA Office of Defects Investigation. Complaints are submitted by the public and are not verified by NHTSA.

1 recall

2018 BMW 340i recalls and how many were fixed

Each ring shows the share of affected cars repaired, from the manufacturer’s latest quarterly report to NHTSA. Recall repairs are free at authorized dealers.

Recalls apply to specific cars. To see whether a recall is still open on yours, enter the 17-character VIN at nhtsa.gov/recalls or with BMW.

Best & worst years

2018 vs. every other 340i year

Bars show complaints per model year. Colors show the CarFlaw verdict: complaints weighted for crashes, fires and injuries, adjusted for years on the road and compared with the 340i median. How we score

'16'17'18'20'23'24
  • Avoid
  • Caution
  • Solid
  • Best
  • Not rated
1 investigation

NHTSA defect investigations

Federal investigations that included the 2018 BMW 340i, and the recalls they led to.

  1. Desiccated Air Bag Inflator RuptureEA21002 · still open
    Open
In owners' words

What 340i owners report

Recent engine complaints filed with NHTSA, shortened. Personal details are removed.

The radiator failed due to rocks flying through the grill and smashing the radiator causing coolant to flow out of the radiator which could cause deadly issues if a car has no coolant while operating. Bmw knows this is an issue and refuses to warranty/recall the parts. They know its an issue…
Complaint 11552110 · Oct 26, 2023
RETURNING FROM A LOCAL GROCERY STORE I DROVE INTO OUR GARAGE AND SHUT OFF THE ENGINE. IMMEDIATELY I HEARD A LOUD POP FROM THE ENGINE COMPARTMENT, LIKE FROM A FIRECRACKER, AND I SAW BLACK SMOKE COMING FROM THE HOOD AND FROM THE LEFT WHEEL WELL. I IMMEDIATELY TRIED TO RESTART THE CAR TO DRIVE OUT OF…
Complaint 11399787 · Mar 8, 2021 · 20,000 miles

Own a 2018 340i?

Decode your VIN to see the recalls for your exact car, then confirm open recalls with NHTSA.