2021 BMW 330i Turbocharger Replacement TSB
A manufacturer communication (NHTSA ID 10184572) indicates that some 2021 BMW 330i vehicles may experience a loss of engine output and an illuminated Malfunction Indicator Lamp (MIL), necessitating exhaust turbocharger replacement.
Symptoms
Owners of the 2021 BMW 330i may notice a significant reduction in engine power, described as a "loss of engine output." This issue is often accompanied by the illumination of the "malfunction indicator lamp (MIL)" on the dashboard. These are key indicators that a problem exists within the engine or exhaust system.
Diagnosis and Trigger Conditions
This manufacturer communication, identified by NHTSA ID 10184572, addresses potential issues that lead to the symptoms described. The underlying cause for the loss of engine output and MIL illumination is linked to the exhaust turbocharger system. Technicians will need to diagnose the specific fault triggering these warnings.
Repair Procedure Summary
According to this TSB, the recommended repair for the described symptoms in the 2021 BMW 330i is to "REPLACE EXHAUST TURBOCHARGER." This involves removing the existing turbocharger unit and installing a new one. This procedure aims to resolve the engine output issues and clear the malfunction indicator lamp.
Owner Action
If you own a 2021 BMW 330i and experience a loss of engine output or see the "malfunction indicator lamp (MIL)" illuminated, it is recommended to contact your authorized BMW service center. Inform them of the symptoms and mention this 2021 BMW 330i manufacturer_communication (NHTSA ID 10184572) for reference. The service center will be able to diagnose the issue and perform the necessary exhaust turbocharger replacement if required.
Source: NHTSA ID: 10184572
What BMW 330i owners report
Counted from the records in our database across 16 model years.
- 818
- Owner complaints
- 39
- Recalls
- 863
- Service bulletins
- 30
- Crashes reported
- 38
- Fires reported
- 36
- Injuries reported
The 2021 model year
29 complaints, the 10th most of 16 model years on file. Owners reported 1 crash, 3 fires and 1 injury for this year, which also has 7 recalls on file.
Engine And Engine Cooling, the system this article covers, accounts for 40 of 818 complaints (5%), including 1 for 2021.
Complaints by model year
| 2001 | 116 | |
|---|---|---|
| 2002 | 45 | |
| 2003 | 77 | |
| 2004 | 113 | |
| 2006 | 219 | |
| 2017 | 42 | |
| 2018 | 32 | |
| 2019 | 41 | |
| 2020 | 53 | |
| 2021 | 29 |
Most-reported systems
- Air Bags — 246
- Exterior Lighting — 153
- Electrical System — 132
- Engine — 89
- Power Train — 44
Latest recalls for the 2021 model year
- 26V056000 — Electrical System (Jan 2026)
- 25V636000 — Electrical System (Sep 2025) — Park outside
- 23V584000 — Electrical System (Aug 2023)
Recent owner reports about engine and engine cooling
Read owner complaints →The 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.
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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