I think I know the answer to this, but the dealer is telling me that reprogramming is required when replacing all of the glow plugs and control module. Hinted similar was required for engine coolant and transmission fluid thermostat replacement also. I don't buy it and never seen it done as part of the DIYs I've reviewed thus far.

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8/2011 X5 xDrive35d Sport, Black Sapphire Metallic, Black Nevada Leather, Fine Burr Walnut Trim
2/2001 M5, Jet Black, Exclusive Complete Black Walk Nappa Point Heritage Leather, Black Cubic Trim