My start would be 55C4. No message from DSC. A wheel speed sensor is acting up intermediately. Or steering angle sensor? The last two probably relate to 55C4.

As for D3, I would suspect the MAF sensor. Clear the codes and run without the MAF connected. How long does it take for a code set? Drive it reasonably to the same amount of time.

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'06 X5 3.0i - bought @143,123 miles (12/26/20)