Unfortunately, my DME's 30BB error did not go away even after replacing the mosfets. The mosfets seemed ok to begin with and I did not detect any S/D shorts. I ended up upgrading to a MSD81. Other things that can go wrong with an MSD80 is the controller IC for the injectors which is not so easy to replace. I suspect this was the case with my MSD80. Big thumbs down to BMW for such a crappy product.
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