Freddie
Have a look at the (passenger side USUALLY ) top intercooler hoses for a split ; usally underneath ! Under a high engine load if this occurred you would get the same indications that you have mentioned. It creates an overboost which sets off all the alarms, once you have stopped and restarted all pressures are in normal ranges and there are no issues. Cheap 20 min fix ; new hoses preferably silicon and cheaper than OEM. You will need to take the hoses off for a proper inspection, some splits can be very small and can also be under the area of the worm drive hose clamps. The other possibility is a cracked inlet manifold, again only under load, you would need a smoke test to be certain. I have had this problem, and it was caused by a cracked manifold, that needed replacing. Usually with the manifold crack you would have had a repeat of the symptoms by now. Good luck.
Laurie
2010 TdV8 Autobiography, D2 Td5, RRC 4 Door VM/300Tdi, RRC 2 Door V8
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