Have you checked the battery condition, as a duff battery can exhibit many spurious issues. A good battery should read 12.6v with the engine off.
If you have used the car recently, leave the headlights on for 2 minutes to remove any residual charge.
If below 12.4v, needs a charge, and if below 12.2v, probably duff.
In all cases below 12.6v, try charging the battery first, and if will not hold 12.6v, replace.
Also, may wish to check charging circuit.
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Current: 2018 BMW G11 740d MSport XDrive
Past: 2015 Audi 3.0tdi A8L, 2012 Audi 3.0tdi A8L, 2009 Audi 3.0tdi A8, 2005 Jaguar 4.2V8 XJL, 2000 Jaguar 4.0V8 XJL + many others
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