BMW MSD80 to MSD81 conversionUnderstanding the BMW MSD80 to MSD81 Conversion MSD80 has potential problems that are likely to happen: 1) The first problem is MOSFET failure MOSFETs are electronic components on the MSD80 board, that do fail due to age or high performance, and when one of them fails, it causes the car to misfire hard and go into limp mode With bad MOSFET, either the first bank is misfiring or the second bank In case of bank 1 misfire, there are these errors codes:
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