Most common 2018 BMW 640i problems
Share of the 5 complaints; one complaint can involve more than one system. "~" is the median mileage when the problem started.
BMW 640i complaints by model year
Best 640i years: 2012, 2015. Compare all years →
2018 BMW 640i recalls (2)
Back over prevention › Sensing system › Camera
BMW of North America, LLC (BMW) is recalling certain 2018 540d, 2018-2020 530i, 530i xDrive, 540i, 540i xDrive, M550i xDrive, M5, 530e, 530e xDrive, X3 sDrive, X3 xDrive, X3 M40i, X3 M, and 2019-2020 X4 xDrive, X4 M40i, X4 M, X7 xDrive, X7 M50i, 740Li, 740Li xDrive, 750Li, 750Li xDrive, 8 Series Convertible and Coupe 840i, 840i…
Remedy: BMW will notify owners, and dealers will update the back-up camera software, free of charge. The recall began November 8, 2019. Owners may contact BMW customer service at 1-800-525-7417 or Rolls-Royce at 1-877-877-3735.
Engine and engine cooling › Engine
BMW of North America, LLC (BMW) is recalling certain 2018 BMW 540d xDrive vehicles. The crankshaft sensor may be equipped with incorrect firmware, preventing the sensor from properly processing input from the crankshaft reluctor ring, possibly resulting in a vehicle stall.
Remedy: BMW will notify owners, and dealers will replace the crankshaft sensor, free of charge. The recall began September 6, 2018. Owners may contact BMW customer service at 1-800-525-7417.
NHTSA defect investigations
Federal safety investigators have looked into a possible defect involving the 2018 BMW 640i:
Desiccated Air Bag Inflator Rupture
From 2000 through 2017, Takata produced millions of air bag inflators using two types of phase-stabilized ammonium nitrate ("PSAN") propellant -- propellant 2004 and propellant 2004L. After prolonged exposure to high temperature cycles and humidity, inflators using propellant 2004 can degrade, causing the propellant to burn too quickly when ignited.
2018 BMW 640i engines & fuel economy
| Engine | Transmission | Drive | MPG city / hwy / combined |
|---|---|---|---|
| 3.0L 6-cyl turbo | 8-speed automatic | RWD | 20 / 29 / 23 |
| 3.0L 6-cyl turbo | 8-speed automatic | AWD | 20 / 28 / 23 |
EPA ratings. Class: Subcompact car.
Frequently asked questions
Is the 2018 BMW 640i a good car?
Based on 5 owner complaints filed with NHTSA, the 2018 640i rates average: about as many complaints as a typical year of the 640i at the same age. Complaint counts don't account for sales volume or individual maintenance, so have any used car inspected before buying.
What is the most common problem with the 2018 BMW 640i?
The driver assistance — 2 complaints, 40% of all complaints for this model year, most often about adaptive cruise control. Next are the electrical system (1) and engine & cooling (1).
How many recalls does the 2018 BMW 640i have?
There are 2 recalls for the 2018 BMW 640i, the most recent from September 27, 2019 (camera). Recall repairs are free at any authorized dealer — check whether yours has been done with the VIN recall check.
What are the best and worst years of the BMW 640i?
The best years by complaints, compared at the same age, are 2012 and 2015. See the full BMW 640i years comparison.
At what mileage do 2018 BMW 640i problems happen?
The median mileage reported in complaints is about 19,000 miles; 100% of problems with a recorded mileage started before 50,000 miles.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.