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SIB 12 12 21: Back over prevention bolt torque check
Back over prevention bolt torque check on BMW G01/G20/G21/G30 and other models (2017–2021); BMW explains the cause and the approved repair.
BMW service bulletin · NHTSA ID 10205615 · Nov 2021 · also written SI B12 12 21, B121221
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.
Due to an unfavorable operating point primarily in the low-end torque range, the fuel vapor scavenging that takes place in that range may result in incorrect detection of a mixture that is too rich. As a result, an incorrect mixture adaptation value is stored.
Details
| Bulletin number | SIB 12 12 21 Also written: SI B12 12 21, B121221, 12 12 21, SIB-12-12-21, SI B121221 |
|---|---|
| NHTSA ID | 10205615 |
| Document IDs filed | B121221 |
| Type | Service bulletin |
| Date | |
| Models | 330e, 330i, 530e, 530i, 540d, 540i, M340i, M550i, X3 |
| Model years | 2017–2021 |
| Chassis | G01, G20, G21, G30, G31, F30, F34, F97 |
| Engines | B46/B48, B47, B57, B58, N63, S58 |
| Component (NHTSA) | Back Over Prevention |
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.
More for these cars
F30 repair costs G01 repair costs G20 repair costs G30 repair costs All B46/B48 bulletins All B57 bulletins All B58 bulletins All N63 bulletins All S58 bulletins
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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.