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Update:
Now I figured out what need to be replaced if airbag deployed in collision (let's use example of driver airbags deployed):
0. Airbag of course.
1. seat belt pre-tensioner ( the one you buckle up your seatbelt in it, on the right side of the car cushion)
2. Seat belt itself. can send out for rebuild, or buy used from eBay or elsewhere.
3. The battery Positive terminal cable (BST terminal), which has an explosive device to disconnect the cable internally , triggered by airbag signal. (error code 93B2). This BST terminal cable on e93 is unique, it's not the same as the one from e90/e92.
4. If the active headrest is also deployed, then inside the headrest there is a explosive device too, you need to replace it.(error code 93ae for driver seat, 93af for passenger seat) - part #: 52109169585 (Repair kit, crash-active head restraint).
Otherwise, you will always get the airbag light and seatbelt light on the dash.
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