Looking through your previous posts.
A loose battery negative terminal may have caused the 999999 error. A guru will know.
The FBH is a prime candidate for running the battery flat. (Satnav as well ?)
Disconnect the multipole connector FIRST, then disconnect the 2 pole POWER cable. Leave the multipole cable disconnected, as there is a known issue with lack of power on the FBH causing a fault elsewhere.
Then see if the battery running flat fault resolves itself.
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