That doesn't look like a Peake code to moi. You generally get a reference to a table, then a letter/number combo. For example, my bad secondary air pump valve threw table 19, F5, F6, and my bad O2 sensor was table 19, then 3d [as best I recall]. The Peake codes table is readily available online.

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2006 X5 3.0 6-spd w/Evo UUC ssk
sport/premium pkgs
born Valentine's Day, 2006.