Under my Volvo bonnet is a nest of vipers waiting to let loose one day. It will be someone else having the problems as i only keep for 3 years while it has a warranty.
I now find it has a supercharger powered by the 48 volt battery to give high torque when accelerating to boost the turbochargers input. That battery also turns the alternator into a motor and adds power by using the timing belt to drive the engine. Complexity at its highest level.