Technical Service Bulletin B121021 — 2017 BMW 540I
EXTERIOR LIGHTING
Bulletin Details
| TSB ID | B121021 |
| Manufacturer | |
| Vehicle | 2017 BMW 540I |
| Component | EXTERIOR LIGHTING |
| Communication Date |
Bulletin Summary
The customer complains that under moderate throttle application or on deceleration after throttle application, a Malfunction Indicator Lamp (MIL) is displayed in the instrument cluster.
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.