Technical Service Bulletin B121125 — 2025 BMW 740I
ELECTRICAL SYSTEM
Bulletin Details
| TSB ID | B121125 |
| Manufacturer | |
| Vehicle | 2025 BMW 740I |
| Component | ELECTRICAL SYSTEM |
| Communication Date |
Bulletin Summary
A 740i Sedan, 740i xDrive Sedan (B58N - ICEV), or a 750e xDrive Sedan (XB1N - PHEV) may have one orboth of the following faults stored in the DME: 034AA5 - Mixture control bank 1, lambda regulation, mixture too lean 034AA8 - Mixture control bank 1, lambda adaptation, mixture too rich And additionally with the faults above, these affected vehicles may have one or more of the followingirregular combustion-related faults also stored: 033812 033813 033814 033815 033816 033817 033818 033819
About Technical Service Bulletins
A Technical Service Bulletin (TSB) is a document issued by a vehicle manufacturer to its dealers, describing a known issue with a specific vehicle or set of vehicles and the recommended procedure to fix it. Unlike recalls, TSBs are not mandatory and are typically only performed if an owner reports the related issue. However, TSBs can be an indicator of common problems with a vehicle.