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To the best of my understanding, the "umbrella" SI B18 05 12, calls for an inspection to determine IF your metering valve requires replacement along with other components....its general. In a certain sense SI B 18 04 12 is more specific in that it narrows down to a more particular date range WHICH production months require THIS replacement of THIS part. I wouldn't bet my life, but I would bet a beer, if you are within the range and they didn't replace, you still have the old design.
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