The ECU in the 2.5 turbo is only responsible for boost control, idle speed correction and EGR operation, it has no direct control of fuel delivery. I don't see the ECU would have any idea your car was running without oil pressure.
I don't think you can "reset" it like your PC - the ECU does have a self diagnostic capability using an impulse counter. It sounds like the boost control function is not working.
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