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The exhaust pressure being too low will effectively lead to charging pressure being too low as it won’t have the optimum pressure to turn the exhaust turbine, or am I wrong in saying that? Yes I did reset adaptations when I replaced the MAP (not MAF). As you suggest, the pressure could be low due to either the EGR valve not closing or the wastegate not closing properly. Are both EGR valves and wastegate valves controlled via the vacuum system? Car seems to be getting enough air as if it wasn’t I’m sure I would be getting subsequent errors for the intake system. Currently on 70526 miles, it started very intermittent and now occurs every time I get into the car from cold, accelerating up to about 40mph and varies but usually about 2k rpm triggers the fault.
The EGP is attached to a hose, no visible leaks and I did prod it with a hanger to see if it was blocked but was all OK
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