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SIB 12 03 24: Exhaust fault codes
Exhaust fault codes on B46/B48 engines (2024–2025); BMW explains the cause and the approved repair.
BMW service bulletin · NHTSA ID 11028920 · Feb 2026 · also written SI B12 03 24, B120324
What it covers
A service bulletin tells BMW technicians how to diagnose or fix a known issue. It is not a recall: a repair under a bulletin is normally paid by the owner unless the car is still under warranty or a warranty extension applies.
The Engine Malfunction Warning is illuminated, and the following fault code is stored in the DME- FC 034AEF Exhaust Cold Start, Not Controllable
Details
| Bulletin number | SIB 12 03 24 Also written: SI B12 03 24, B120324, 12 03 24, SIB-12-03-24, SI B120324 |
|---|---|
| NHTSA ID | 11026948, 11028920 (revisions) |
| Document IDs filed | B120324 |
| Type | Service bulletin |
| Date | (first filed Dec 2025) |
| Models | X1, X2 |
| Model years | 2024–2025 |
| Chassis | U10, U11 |
| Engines | B46/B48 |
| Component (NHTSA) | Electrical System Engine |
Model, year and engine coverage comes from NHTSA's records. Not every car in this range is affected; the official document lists the exact production dates and conditions.
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Before you pay, check the VIN for recalls. Some failures are covered by a safety recall or a BMW warranty extension.
Source: NHTSA Manufacturer Communications (public data). BimmerBench is not affiliated with BMW or NHTSA. The title and description above are our own plain-English summary; the full bulletin is BMW's document, linked above.