BestCarRank
Bmw

2021 Bmw M340I

Problems, Recalls & Reliability Report

Excellent Reliability

Quick Summary

The 2021 Bmw M340I has 13 owner complaints filed with NHTSA — that's 0.2x the segment average of 80. The most common issue is engine problems (38% of all complaints), specifically: at approximately 20,000 miles, vehicle indicated excessively low oil. the dealer indicated oil level was excessively low but did not identify the problem,. the vehicle was filled and returned to owner. within 1000 miles, the incident occurred again. dealer replaced replaced the valve cover claimin.

13

Total Complaints

0

Recalls Issued

—/5

Safety Stars

0.2x

vs Segment Avg

Known Problems

ENGINE

5 complaints
38%
  • • At approximately 20,000 miles, vehicle indicated excessively low oil. The dealer indicated oil level was excessively low but did not identify the problem,. The vehicle was filled and returned to owner. Within 1000 miles, the incident occurred again. Dealer replaced replaced the valve cover claimin
  • • At approximately 20,000 miles, vehicle indicated excessively low oil. The dealer indicated oil level was excessively low but did not identify the problem,. The vehicle was filled and returned to owner. Within 1000 miles, the incident occurred again. Dealer replaced replaced the valve cover claimin
  • • I am reporting a safety concern involving BMW vehicles equipped with the B58 Technical Update (B58TU) engine, commonly found in model years 2019–2021. These vehicles utilize a variable-displacement engine oil pump containing an internal thermoplastic adjusting component responsible for regulating o
Typical onset: 50K miles Est. repair: $500

“At approximately 20,000 miles, vehicle indicated excessively low oil. The dealer indicated oil level was excessively low but did not identify the problem,. The vehicle was filled and returned to owner. Within 1000 miles, the incident occurred again. Dealer replaced replaced the valve cover claimin”

— NHTSA complaint filing

TRANSMISSION

3 complaints
23%
  • • The contact owns a 2021 BMW M340I. The contact stated while driving various speeds, the vehicle independently shifted from reverse(R) to drive(D) to park(P). The contact stated that while driving approximately 10 MPH and attempting to stop the vehicle, the brake pedal was depressed and went to the f
  • • While driving through an intersection and making a left turn, a failure of the engine water pump pulley caused the pulley to break apart. This led to damage to the coolant line and tensioner, sudden coolant loss, and the serpentine belt slipping off. The failure occurred mid-turn, causing the vehic
  • • Here’s a strong version that sounds frustrated but still credible and harder to dismiss: I’ve owned many vehicles over the years, and this BMW has been, without question, the most problematic car I’ve ever had. The list of issues has been absurd for a vehicle in this price range and from a brand t
Typical onset: 50K miles Est. repair: $500

“The contact owns a 2021 BMW M340I. The contact stated while driving various speeds, the vehicle independently shifted from reverse(R) to drive(D) to park(P). The contact stated that while driving approximately 10 MPH and attempting to stop the vehicle, the brake pedal was depressed and went to the f”

— NHTSA complaint filing

BRAKES

1 complaints
8%
  • • The contact owns a 2021 BMW M340I. The contact stated while driving various speeds, the vehicle independently shifted from reverse(R) to drive(D) to park(P). The contact stated that while driving approximately 10 MPH and attempting to stop the vehicle, the brake pedal was depressed and went to the f
Typical onset: 50K miles Est. repair: $500

“The contact owns a 2021 BMW M340I. The contact stated while driving various speeds, the vehicle independently shifted from reverse(R) to drive(D) to park(P). The contact stated that while driving approximately 10 MPH and attempting to stop the vehicle, the brake pedal was depressed and went to the f”

— NHTSA complaint filing

SUSPENSION

1 complaints
8%
  • • Started as low creaking noise coming from front left wheel. Slow speeds, over small bumps. Over time (one month), creaking noises became louder and more frequent. At that time, steering was starting to feel stiff when turning to the left. Taken to 2 BMW dealerships who said it was just a noise and
Typical onset: 50K miles Est. repair: $500

“Started as low creaking noise coming from front left wheel. Slow speeds, over small bumps. Over time (one month), creaking noises became louder and more frequent. At that time, steering was starting to feel stiff when turning to the left. Taken to 2 BMW dealerships who said it was just a noise and”

— NHTSA complaint filing

STEERING

1 complaints
8%
  • • Started as low creaking noise coming from front left wheel. Slow speeds, over small bumps. Over time (one month), creaking noises became louder and more frequent. At that time, steering was starting to feel stiff when turning to the left. Taken to 2 BMW dealerships who said it was just a noise and
Typical onset: 50K miles Est. repair: $500

“Started as low creaking noise coming from front left wheel. Slow speeds, over small bumps. Over time (one month), creaking noises became louder and more frequent. At that time, steering was starting to feel stiff when turning to the left. Taken to 2 BMW dealerships who said it was just a noise and”

— NHTSA complaint filing

Estimated Repair Costs

ENGINE(~50K mi)
$500
TRANSMISSION(~50K mi)
$500
BRAKES(~50K mi)
$500
SUSPENSION(~50K mi)
$500
STEERING(~50K mi)
$500

Estimates based on average reported repair costs. Actual costs vary by location, shop, and severity.

🔍 Pre-Purchase Inspection Checklist

Based on 13 owner complaints for this specific year, here's what to check or ask about:

  • ☐
    ENGINE: At approximately 20,000 miles, vehicle indicated excessively low oil. The dealer indicated oil level was excessively low but did not identify the problem,. The vehicle was filled and returned to owner. Within 1000 miles, the incident occurred again. Dealer replaced replaced the valve cover claimin

    Typically appears around 50K miles. Repair cost ~$500

  • ☐
    TRANSMISSION: The contact owns a 2021 BMW M340I. The contact stated while driving various speeds, the vehicle independently shifted from reverse(R) to drive(D) to park(P). The contact stated that while driving approximately 10 MPH and attempting to stop the vehicle, the brake pedal was depressed and went to the f

    Typically appears around 50K miles. Repair cost ~$500

  • ☐
    BRAKES: The contact owns a 2021 BMW M340I. The contact stated while driving various speeds, the vehicle independently shifted from reverse(R) to drive(D) to park(P). The contact stated that while driving approximately 10 MPH and attempting to stop the vehicle, the brake pedal was depressed and went to the f

    Typically appears around 50K miles. Repair cost ~$500

  • ☐
    SUSPENSION: Started as low creaking noise coming from front left wheel. Slow speeds, over small bumps. Over time (one month), creaking noises became louder and more frequent. At that time, steering was starting to feel stiff when turning to the left. Taken to 2 BMW dealerships who said it was just a noise and

    Typically appears around 50K miles. Repair cost ~$500

  • ☐
    General: Get a pre-purchase inspection from an independent mechanic ($100-$200)

Bmw M340I — Year Comparison

How does 2021 compare to other years? Fewer complaints = more reliable.

2022
8Excellent Reliability
2021
13Excellent Reliability
2020
60Average
Full years-to-avoid analysis →

NHTSA Safety Rating

No NHTSA safety rating available

At a Glance

Complaints
13
Recalls
0
Fire reports
0
Crash reports
0
Injury reports
0
Segment avg
80

Check a Specific VIN

See recalls for YOUR 2021 Bmw M340I

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