The documented pattern
The bulletin concerns repeatable rough cold starts, misfire faults and, on inspection, fuel-wet spark plugs with deposits at injector tips. Leaking or poorly atomizing injectors can explain that combination. A general misfire diagnostic plan is still required.
Sources 1
Before clearing anything
Save the fault report
Record the exact codes, affected cylinders, ambient conditions and how long the rough running lasts. Keep the report before anyone erases it. Note whether the engine had fully cooled or was restarted warm.
Describe the pattern
Tell the technician whether this happens every morning, after a long park, only after refueling, or under load too. Include recent plug, coil, injector and software work. These observations help reproduce the complaint; they are not proof of a cause.
Why this is not an injector shopping list
A qualified technician should compare the car with the bulletin and its current diagnostic instructions. Injector revisions and installation requirements matter. This guide does not reproduce the old bulletin’s parts list or authorize mixing revisions.
Sources 1
Bring to the appointment
Bring the cold-start notes, a saved scan and service invoices. Ask what evidence supports the proposed repair and how the cold-start result will be checked afterward.
Sources / references 1
- BMW — SI B13 04 09, March 2013 (archived OEM bulletin) ↗Reviewed Sep 27, 2026
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