Last updated: 2026-03-04
2021 BMW 3-Series Reliability Score & Common Problems
The 2021 BMW 3-Series scores 67/100 ("Good"). With 9 recalls and 22 owner complaints, reliability is acceptable but not class-leading.
2021 is year 3 of the Seventh generation (G20).
Recalls
9
Complaints
22
Complaint Rate
4.4
per 10k sold
Below avgEst. Annual Cost
$773
Major Repair Risk
12%
NHTSA Rating
5/5
Score Breakdown
Component-weighted complaints normalized by sales volume
Independent repair cost ratings
Recall count weighted by severity
Breadth of reported problem categories
Acceptable reliability — worth considering with a pre-purchase inspection.
Top Issues
9 recalls on record
Generation & Refresh (US)
2021 is year 3 of the Seventh generation (G20).
- Redesigned for the 2019 model year.
- Well-established in its generation — most early issues should be resolved.
- A refresh arrives in 2022.
- 7th generation 3-Series (US).
What this means for buyers
Well into the generation cycle — most design and manufacturing issues should be resolved by now.
Seventh generation (G20)
Should You Buy the 2021 BMW 3-Series?
The 2021 BMW 3-Series scores 67/100 ("Good"), placing it in acceptable but not class-leading territory. 2021 is year 3 of the Seventh generation (G20).
With 22 owner complaints, some reported issues may need attention, but we don't yet see evidence of a single dominant failure mode.
A pre-purchase inspection is recommended for used examples, with particular attention to electrical system (6). An extended warranty may provide additional peace of mind.
Compared to the 2022 BMW 3-Series, which scored 3 points higher. See also the 2020 BMW 3-Series for an earlier comparison.
Pros
- Acceptable reliability score
- Low major repair risk (12%)
- Below-average complaint rate for Sedan
Cons
- Frequent unscheduled repairs
- Above-average recall count
- ELECTRICAL SYSTEM issues reported (6 complaints)
Compare 2021 BMW 3-Series With
2021 Tesla Model 3
Score: 48/100
2021 Kia K5
Score: 71/100
2021 Toyota Camry
Score: 82/100
2021 Honda Accord
Score: 78/100
2021 Nissan Altima
Score: 79/100
Common Problem Categories
Safety
- 9 manufacturer recalls issued
Other
- ELECTRICAL SYSTEM (6)
- UNKNOWN OR OTHER (3)
- ENGINE (2)
- SUSPENSION (2)
- AIR BAGS (2)
- POWER TRAIN (2)
- STRUCTURE (1)
- ENGINE AND ENGINE COOLING (1)
- STEERING (1)
- VISIBILITY/WIPER (1)
- LANE DEPARTURE (1)
Recall Overview
9
recalls on record
The 2021 BMW 3-Series has 9 recalls on record, which is above average. A higher recall count can indicate multiple component concerns. However, recalls also demonstrate that the manufacturer is actively addressing known issues. All recall repairs are performed free of charge at authorized dealerships.
NHTSA.gov →Complaint Breakdown
4.4
per 10k soldSegment avg: 12.3
Safety Incidents
Crashes
1
Fires
2
Injuries
2
Deaths
0
Data sourced from NHTSA complaint filings and manufacturer recall notices. Complaint narratives are owner-reported.
2021 BMW 3-Series Recall Details
9 recalls have been issued for the 2021 BMW 3-Series. All recall repairs are performed free of charge at authorized dealerships.
ELECTRICAL SYSTEM
BMW of North America, LLC (BMW) is recalling certain 2021-2023 Toyota Supra, 2022-2023 2 Series Coupe, 2021-2024 5 Series (xDrive), 2021-2022 Z4, 2022-2024 4 Series (Gran Coupe), 2021-2024 4 Series (Convertible and xDrive Convertible), 2021-2023 4 Series (Coupe), 2021-2024 3 Series, 2021-2023 X4, 2021-2024 X3 vehicles. Please see the recall report for a complete list of all models. The engine starter may overheat and catch fire due to wear on an internal component.
Consequence
Fire increases the risk of injury.
Remedy
Dealers will replace the engine starter, free of charge. Owner notification letters are expected to be mailed March 24, 2026. Owners may contact BMW customer service at 1-800-525-7417 or Toyota's customer service at 1-800-331-4331. Vehicle Identification Numbers (VINs) involved in this recall will be searchable on NHTSA.gov beginning March 24, 2026.
ELECTRICAL SYSTEM
BMW of North America, LLC (BMW) is recalling certain 2019-2021 BMW 330i, 2019-2022 BMW Z4, 2020-2022 BMW 530i, X3, X4, Toyota Supra, 2021-2022 BMW 430i, 430i Convertible, and 2022 BMW 230i vehicles. The engine starter relay may corrode, causing the relay to overheat and short circuit.
Consequence
A short circuit in the starter relay may increase the risk of a fire.
Remedy
Owners are advised to park their vehicles outside and away from structures until the remedy is complete. Dealers will replace the engine starter, free of charge. Owner notification letters were mailed February 6, 2026. Owners may contact BMW customer service at 1-800-525-7417. Vehicle Identification Numbers (VINs) involved in this recall will be searchable on NHTSA.gov beginning November 14, 2025.
SEAT BELTS, ELECTRICAL SYSTEM
BMW of North America, LLC (BMW) is recalling certain 2019-2022 330i, 330i xDrive, M340i, 2022 430i Coupe, 2021-2022 430i, M440i Convertible, and 2020-2022 228i xDrive Gran Coupe vehicles. The receiver audio module control unit software may fail to properly generate audible seat belt warnings to the driver to fasten their seat belt. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 208, "Occupant Crash Protection."
Consequence
An audible chime that does not properly alert the driver to fasten their seat belt increases the risk of injury in a crash.
Remedy
Dealers will update the receiver audio module software, free of charge. Owner notification letters were mailed October 12, 2023. Owners may contact BMW customer service at 1-800-525-7417.
2021 BMW 3-Series NHTSA Safety Ratings
Overall Safety Rating
Crash Test Results by Configuration (expand)
Gas Powertrain
Rollover risk: 9.2%
Safety Technologies
BMW 3-Series Repair Costs & Maintenance
Maintenance Rating
3Maintenance rating: 3 out of 5Based on NHTSA complaint patterns, recall severity, and publicly available cost benchmarks.
Est. Annual Maintenance
$773
Repair Frequency
1
unscheduled repair visits per year
Severe Repair Probability
12%
chance of a major repair
Category-level averages derived from publicly available industry reports (AAA, CarMD). Model-level estimates produced by Auto Reliability Index.
2021 BMW 3-Series Example Repair Prices
National average price ranges for common repairs. These are not model-year-specific failure predictions.
| Repair | Estimated Cost |
|---|---|
| Ignition Switch Replacement | $265 – $314 |
| AC Recharge | $322 – $421 |
| Battery Cable Replacement | $555 – $626 |
| Battery Cable Replacement | $691 – $790 |
| Power Seat Motor Replacement | $1,882 – $1,940 |
| Body Control System Diagnosis & Testing | $61 – $90 |
| Brake Light Switch Replacement | $163 – $213 |
| Power Steering Hose Replacement | $2,656 – $2,901 |
| Tire Pressure Monitor Control Module Replacement | $638 – $781 |
| Rack and Pinion Replacement | $6,618 – $7,005 |
Estimates based on national average repair costs. Actual costs may vary by location and shop.
When Buying a Used 2021 BMW 3-Series
Key things to inspect or verify before purchasing, based on the most common reported issues.
- Inspect engine mounts for wear or failure, especially around 40,000 miles
- Test sunroof operation and inspect for any signs of stress or damage
- Check for any electrical system error messages or starting issues
- Verify alignment and inspect suspension components for wear
- Ensure all recalls have been addressed, particularly for electrical system
Check Any 2021 BMW 3-Series's History Before You Buy
Reliability scores tell you what to expect from the 2021 3-Series in general — but every car has its own story. Uncover past accidents, title issues, odometer rollbacks, and service records for a specific BMW 3-Series with a free VIN lookup.
Powered by VINExposed.com — free vehicle history reports using public title and safety data.
2021 BMW 3-Series Common Problems by Component
22 owner complaints grouped by vehicle system.
ELECTRICAL SYSTEM
6 complaintsSafety-relatedOwners of the 2021 BMW 330i frequently report issues related to the vehicle's electrical system, with several complaints linked to a specific recall for which parts are not yet available. Common symptoms include difficulty starting the vehicle, unexpected engine shutdowns, and persistent error messages indicating problems with the engine and passenger restraint system. One report involves a fire that occurred while driving, highlighting a significant safety concern. These issues are reported at varying mileages, including one instance at approximately 33,672 miles. Potential buyers should be aware of these recurring electrical problems and the associated recall delays when considering this model.
UNKNOWN OR OTHER
3 complaintsOwners of the 2021 BMW 3-Series report several issues under the unknown or other category. One common complaint involves the sunroof shattering spontaneously at highway speeds, posing a risk of injury from falling glass and potential loss of vehicle control. Another issue involves concerns over a potential fire hazard related to engine starter relays, with owners expressing frustration about delayed recall notifications. Additionally, some owners describe inaccurate odometer readings and erratic behavior of front sensors, particularly in adverse weather conditions. These problems appear to occur at varying mileage ranges, with tire failures reported within 15,000 miles. Safety implications include potential injuries from glass, fire risks, and distraction from sensor malfunctions.
ENGINE
2 complaintsOwners report two main issues with the 2021 BMW 3-Series engine. One complaint highlights a recall related to the engine starter, with the owner noting a lack of available remedy or timeline for resolution. Another owner describes motor mount failure at approximately 52,000 miles, after purchasing the vehicle as a Certified Pre-Owned (CPO) at 27,000 miles, suggesting early failure within 30,000 miles of purchase. The motor mount issue leads to unsafe driving conditions until repairs are completed. No crashes, fires, or loss of control are mentioned in the complaints, but the described symptoms may impact driving safety.
SUSPENSION (2 complaints)
SUSPENSION
2 complaintsOwners of the 2021 BMW 3-Series report issues with suspension components, particularly concerning engine mounts and front axle support. One owner describes engine mounts failing shortly after the warranty expired at 43,000 miles, which they were told poses a safety risk. Another owner reports that the front axle support and right front control arm bearing bracket may be separating, leading to persistent alignment problems and accelerated tire wear. These issues appear to occur at relatively low mileages, with one owner experiencing problems despite limited driving. Safety implications include potential loss of vehicle alignment, which may affect handling and tire longevity.
AIR BAGS (2 complaints)
AIR BAGS
2 complaintsSafety-relatedOwners of the 2021 BMW 3-Series report airbag system warnings and deployment issues. One complaint describes a warning message indicating reduced functionality of the airbags and seatbelt systems without prior vehicle damage, suggesting potential electronic or sensor-related issues. Another report involves a crash where unintended acceleration led to a collision, after which the airbags deployed. This incident resulted in one injury and the vehicle being totaled. These complaints highlight safety concerns related to airbag system performance and unintended acceleration, particularly during low-speed maneuvers like parking.
POWER TRAIN (2 complaints)
POWER TRAIN
2 complaintsOwners of the 2021 BMW 3-Series report issues related to the power train, specifically involving rodent damage to soy-based engine wiring and transmission problems. Complaints describe symptoms such as engine performance restrictions, drive train malfunction warnings, and sudden stalling followed by a violent jolt when accelerating from a stop. One report links a transmission slip to a physical injury, suggesting potential safety implications. These issues are noted without specific mileage or timeline patterns. Potential buyers should be aware of these reported problems, especially concerning rodent attraction to wiring and transmission behavior during electric mode operation.
STRUCTURE (1 complaints)
STRUCTURE
1 complaintMy sunroof exploded randomly, without warning as I was traveling on the highway at approximately 65 MPH. There was no impact from an object. The cloth cover beneath the sunroof was fully intact and undamaged after the incident.
ENGINE AND ENGINE COOLING (1 complaints)
ENGINE AND ENGINE COOLING
1 complaintSafety-relatedThe contact owns a 2021 BMW 330I. The contact stated while driving 50 MPH and coming to a stop at a red traffic light, the contact started smelling smoke. There was no warning light illuminated. The contact turned off the vehicle, but the vehicle failed to restart with a message that the vehicle was unable to be restarted displayed. The contact turned on the hazard lights with the vehicle stopped in the middle of the road. The contact then noticed that there was smoke coming from the front end of the vehicle and immediately called 911. The contact stated that while a Metro service employee was attempting to assist the contact in towing the vehicle to the side of the road, the worker noticed that fire had started underneath the vehicle and called the Fire Department. The contact exited the vehicle and noticed that there was fire underneath the front end. The contact stated that the front end of the vehicle then burst into flames. The fire was extinguished by the Fire Department. A Fire Department report was filed. The front end of the vehicle was significantly burned. A Police Officer arrived at the scene but had not filed a report because there was no injury sustained. The Police Officer provided his badge number to the contact. The vehicle was towed to a tow lot, where it was being evaluated by the Insurance Company. The contact stated that the vehicle was a total loss; however, the Insurance Company had not yet confirmed that the vehicle was a total loss. The dealer and the manufacturer were not notified of the failure. The vehicle was not yet diagnosed or repaired. The failure mileage was approximately 30,000.
STEERING (1 complaints)
STEERING
1 complaintOn 5/22/24 had a catastrophic failure of the Electric Motor Electronics and 12v Battery. I have requested that the BMW Serice Assistant provide me with all affected parts for inspection. Shutdown of the vehicle high voltage system could result in a crash. When this part fails along with the 12v battery you lose control of all vehicle electronics (steering, braking, electrical power, and propulsion). Yes, there was a previous voluntary recall campaign 19V-599s Service Information Bulletin (Revision 2) which replaced SI B12 27 19 dated October 2019 by BMW for this device. The vehicle and component has been inspected by the Richmond BMW Service Technician. I started to experience problems with the vehicle in late April and took it in for servicing and repair in early May. I was told that the problem was a computer programming recall that was fixed.
VISIBILITY/WIPER (1 complaints)
VISIBILITY/WIPER
1 complaintWhile I was driving down the highway, sunroof has exploded without any apparent reason. I really didn’t realize what had happened at first, all I heard was a loud bang which could’ve lead to distraction and cause an accident. Luckily it wasn’t the case for me. Although, broken pieces of the sunroof has came off and flown to roadway. I brought the vehicle to BMW dealership, by the time I got there there was an apparent hole in the sunroof, they inspected it and saying it happened because something making contact with sunroof but when I asked for a proof for their claim they told me there is no physical evidence to provide.
When Do 2021 BMW 3-Series Problems Start?
Based on owner complaint patterns, here's when common issues tend to appear.
Best & Worst BMW 3-Series Years
Best BMW 3-Series Years to Buy
The best BMW 3-Series year is 2025 with a reliability score of 71/100, rated good. Other strong picks include 2024 (71/100) and 2023 (70/100).
BMW 3-Series Years to Avoid
No BMW 3-Series years are statistical outliers in our data — all years score consistently.
See full BMW 3-Series years-to-avoid analysis →BMW 3-Series Reliability Score Trend
BMW 3-Series reliability has remained consistent across model years, averaging 68/100.
Scores 0–100. Higher is better. Current year highlighted.
| Year | Score | Rating |
|---|---|---|
| 2018 | 65/100 | Good |
| 2019 | 66/100 | Good |
| 2020 | 64/100 | Good |
| 2021 | 67/100 | Good |
| 2022 | 70/100 | Good |
| 2023 | 70/100 | Good |
| 2024 | 71/100 | Good |
| 2025 | 71/100 | Good |
BMW 3-Series Reliability Compared to Other Years
Frequently Asked Questions
Is the 2021 BMW 3-Series reliable?
What are the most common problems with the 2021 BMW 3-Series?
How many recalls does the 2021 BMW 3-Series have?
Is the 2021 BMW 3-Series expensive to maintain?
How We Calculate Reliability Scores
Auto Reliability Index scores are calculated on a 0–100 scale using a weighted formula that combines multiple public data sources. Each factor is weighted based on its predictive value for real-world ownership experience.
Key Ranking Factors
Complaint Severity
NHTSA owner complaints weighted by component category (e.g., powertrain, safety systems, electronics, cosmetic) — safety-critical issues carry more weight than cosmetic ones. Adjusted for sales volume so high-volume models aren't unfairly penalized.
Repair Costs
Independent reliability ratings based on repair frequency, average repair costs, and severity of typical repairs for each model.
Recall Impact
Number of NHTSA recalls weighted by severity. “Stop driving” and fire-risk recalls are penalized more heavily than minor software or labeling recalls.
Issue Diversity
Measures how many major vehicle systems (engine, transmission, electrical, braking, etc.) have recorded complaints. A vehicle with issues spread across many systems may indicate systemic quality issues.
Scores are grouped into four tiers:
- 80–100: Excellent — Top-tier reliability, minimal issues
- 60–79: Good — Reliable with some minor concerns
- 40–59: Mixed — Notable issues, research before buying
- 0–39: Risky — Significant problems, proceed with caution
Data is sourced from NHTSA recall records, owner complaint filings, and independent repair databases. Scores are recalculated as new data becomes available. While the weighting model is proprietary, all underlying data sources are public and traceable.
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