2021 BMW M340

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starting MSRP

Key specs

Base trim shown


Body style

Combined MPGe Combined MPGe

Miles per gallon-equivalent is how the EPA provides efficiency ratings for battery-electric vehicles in a way that can be used in comparison with gasoline-powered vehicles. Actual mileage will vary depending on driving conditions, driving habits, elevation changes, weather, accessory usage (lights, climate control), vehicle condition and other factors.

Related: Top 10 Most Efficient Electric Cars

Seating capacity

185.7” x 56.7”


Rear-wheel drive



The good:

  • Powertrain responsiveness
  • Ride quality
  • High-quality interior materials
  • Trunk room
  • Available 360-degree camera system has many view options
  • Backseat charging options (two USB-C ports)

The bad:

  • Lacks steering feel
  • Difficult to activate some safety features
  • Price gets high very quickly
  • Multimedia system’s learning curve

2 trims

Starting msrp listed lowest to highest price

Wondering which trim is right for you?

Our 2021 BMW M340 trim comparison will help you decide.

See also: Find the best Sedans for 2024

Notable features

  • Android Auto now standard
  • Five-seat compact luxury sedan
  • Choice of turbo four-cylinder (330i) or six-cylinder (M340i)
  • Rear- or all-wheel drive
  • Hands-free low-speed highway driving system available
  • Plug-in hybrid 330e and high-performance M3 also available

2021 BMW M340 review: Our expert's take

What Is the 2021 BMW 3 Series?

The BMW 3 Series is a five-seat luxury sports sedan that competes with the Audi A4, Mercedes-Benz C-Class and Lexus IS. The 330i is powered by a 255-horsepower, turbocharged 2.0-liter four-cylinder engine while the M340i gets a 382-hp, turbocharged 3.0-liter inline-six that works with a mild-hybrid system. Both engines work with an eight-speed automatic transmission, and rear- and all-wheel-drive models are offered. The plug-in hybrid 330e and high-performance M3 are covered separately in the Cars.com Research section. 

What’s New on the 2021 BMW 3 Series?

New standard features include Android Auto smartphone connectivity, keyless entry, automatic high-beam headlights and a one-year subscription to SiriusXM with 360L satellite radio.    

What Features in the 2021 BMW 3 Series Are Most Important?

  • Driving dynamics and performance, particularly M models
  • All-wheel drive available for both 330i and M340i
  • Apple CarPlay and Android Auto standard
  • Navigation standard
  • Automatic city collision mitigation standard
  • Hands-free low-speed highway driving system available

Consumer reviews

Rating breakdown (out of 5):
  • Comfort 5.0
  • Interior 5.0
  • Performance 5.0
  • Value 5.0
  • Exterior 5.0
  • Reliability 5.0

Most recent consumer reviews


Best combination of economy and performance

The word economy on M Performance car might look strange, but as a daily driver, its very important part. You can turn on eco-pro mode, and the car will transfer from extremely powerful and quick beast into a fuel sipping hybrid, that was doing 31 mpg on my highway tests. So far, I can tell that the technology in the car is amazing. Very thought of in many situations, that i am still discovering. I have it with executive package, that adds some nice things like heads up display, etc. I would say that its a must for those cars. At least a premium package is what you want here. Sound with HK system is very good. Clean, and powerful enough. Handling is amazing. Especially if you have M adaptive suspension pack. Good space for 4 and good trunk space as well. Voice communication is much more refined than previous generations. Wireless apple car play is a nice thing too. In a few words - love this car.

See all 1 consumer reviews


New car and Certified Pre-Owned programs by BMW
New car program benefits
48 months/50,000 miles
144 months/unlimited distance
48 months/50,000 miles
Hybrid electric
96 months/80,000 miles
36 months/36,000 miles
Roadside assistance
48 months/unlimited distance
Certified Pre-Owned program benefits
Maximum age/mileage
Certified Pre-Owned Elite with less than 15,000 miles; Certified Pre-Owned with less than 60,000 miles
Basic warranty terms
1 year/unlimited miles from expiration of 4-year/50,000-mile new car warranty
Dealer certification required
196-point inspection
Roadside assistance
View all cpo program details

Have questions about warranties or CPO programs?

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