2021-2022 BMW Mixture Too Rich Detection TSB
A manufacturer communication, NHTSA ID 10228426, addresses an issue in certain 2021-2022 BMW X3, 330e, and 530e vehicles where the engine control unit may incorrectly detect a mixture that is too rich, particularly in the low-end torque range.
También aplica a
- BMW 330e
- 2021–2022
- BMW 530e
- 2021–2022
BMW has issued a manufacturer communication, identified by NHTSA ID 10228426, concerning an engine management issue affecting certain 2021-2022 BMW X3, 330e, and 530e models. This communication addresses instances where the vehicle's system may incorrectly detect a BMW mixture too rich condition.
The issue primarily relates to the POWER TRAIN component, specifically how the engine's air-fuel mixture is monitored under certain driving conditions. Owners of affected vehicles should be aware of this potential diagnostic anomaly.
Symptoms
The primary symptom described in the communication is an "incorrect detection of a mixture that is too rich." While the document does not detail specific dashboard warning lights or performance issues an owner might observe, this internal detection could potentially lead to diagnostic trouble codes or other engine-related notifications if not addressed.
Trigger Conditions
This incorrect detection of a BMW mixture too rich is linked to an "unfavorable operating point." This condition is most prevalent when the engine is operating in the "low-end torque range." This suggests the issue may be more noticeable during acceleration from a stop or at lower engine speeds.
What Owners Should Know
This manufacturer communication, NHTSA ID 10228426, indicates a known issue that BMW is aware of. While the document summary does not outline a specific repair procedure or software update, it highlights a diagnostic challenge that technicians might encounter. If you experience any engine performance issues, warning lights, or concerns related to your vehicle's air-fuel mixture, it is advisable to consult with a BMW service center.
Your dealer can check for any relevant service bulletins or software updates that address the "incorrect detection of a mixture that is too rich" condition. Early diagnosis can help prevent potential long-term issues related to engine performance or emissions.
Source: NHTSA ID 10228426
What BMW X3 owners report
Counted from the records in our database across 23 model years.
- 2,295
- Owner complaints
- 64
- Recalls
- 1,126
- Service bulletins
- 114
- Crashes reported
- 133
- Fires reported
- 118
- Injuries reported
The 2021 model year
113 complaints, the 8th most of 23 model years on file. Owners reported 5 crashes, 2 fires and 2 injuries for this year, which also has 10 recalls on file.
Power Train, the system this article covers, accounts for 247 of 2,295 complaints (11%), including 5 for 2021.
Complaints by model year
| 2004 | 138 | |
|---|---|---|
| 2006 | 143 | |
| 2007 | 258 | |
| 2008 | 122 | |
| 2011 | 126 | |
| 2013 | 226 | |
| 2015 | 105 | |
| 2019 | 171 | |
| 2020 | 110 | |
| 2021 | 113 |
Most-reported systems
- Engine — 494
- Electrical System — 450
- Air Bags — 404
- Power Train — 247
- Seats — 218
Latest recalls for the 2021 model year
- 26V056000 — Electrical System (Jan 2026)
- 25V636000 — Electrical System (Sep 2025) — Park outside
- 24V764000 — Structure (Oct 2024)
Recent owner reports about power train
I am reporting a potential safety defect in BMW vehicles equipped with the B58TU engine, primarily model years 2019–2021. These vehicles use an oil pump containing an internal plastic component responsible for regulating oil pressure.
Read owner complaints →My vehicle is subject to an active safety recall (NHTSA #25V-636) issued in September 2025 involving the engine starter. As of today, no remedy has been provided by the manufacturer.
Complaints are owner reports filed with NHTSA. They are unverified, and counts depend on how many vehicles were sold, so they are not a failure rate.
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