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SIB 34 05 21: EGR valve cracking
EGR valve cracking on BMW G14/G15/G16/F91 and other models (2019–2021); BMW gives diagnosis and repair guidance.
BMW service bulletin · NHTSA ID 10194297 · Apr 2021 · also written SI B34 05 21, B340521
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.
Diagnosis of Compound Brake System Complaints in M Vehicles: 1. Visible cracks are caused by high thermal stresses during rapid heating and cooling of the brake discs. Braking from high speed with cold brake components (less than 212 degrees F) increases the likelihood of cracks to form.
Details
| Bulletin number | SIB 34 05 21 Also written: SI B34 05 21, B340521, 34 05 21, SIB-34-05-21, SI B340521 |
|---|---|
| NHTSA ID | 10194297 |
| Document IDs filed | B340521 |
| Type | Service bulletin |
| Date | |
| Models | 840i, M8, M8 GRAN, M850i |
| Model years | 2019–2021 |
| Chassis | G14, G15, G16, F91, F92, F93 |
| Engines | B58, N63, S63 |
| Component (NHTSA) | Air › Disc Equipment Equipment Adaptive/Mobility Service Brakes |
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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Some failures are covered by a safety recall or a warranty extension. Our free recall check lists NHTSA recalls for your car's model and year.
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.