the 6192 code is a low fuel pressure
This could be a lack of fuel pressure from the electrical pump at the tank.
If the connections to this are corroded or damaged then the pump could stop at any time or could not be running at full speed. Check that its relay switches in and out and the relay contacts are clean and bright – replace the relay if in any doubt and do the same for the fuse,
Ideally measure the pressure at the inlet to the main engine
fuel pump and if this is low check the pump as described and also consider changing the fuel filter as if this partially blocked this too will reduce pressure.
If this is OK then check the small vacuum lines to the turbo and its connected control solenoid on the bulkhead, any cracks or leaks can give turbo issues and its best to have the boost pressure measured to check that the turbo is healthy
If its a variable vane turbo ( they'll be an actuator on the turbo body - but not a wastegate) then check its vacum pipework as above and check the connections to the diaphram / solenoid valve
Also worth considering a bottle of injector cleaner into the tank as a clogged injector nozzle will reduce power and give poor combustion - the next stage on from this is to remove all the injectors and have them ultrasonically cleaned and flow checked
also check the connections and wiring to the fuel pressure sensor as it could be a poor connection here is putting the vehicle into limp home by generating a false fault