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P0238 Turbo Boost Sensor A Circuit High Input
P1249 Wastegate Fail Steady State Test
P1211 ICP Not Ctrllable - Pressure Above/Desired
P1212 ICP Voltage Not at Expected Level
All of those codes can originate from a canned tune. How are you measuring oil pressure - what values are you getting that lead you to believe they are a little high?
I wouldn't get too distracted from the basics - start by checking your glow plugs and GPR.
2003 F-250 XLT Crew Cab 7.3L, Chrome BigTex Grille Guard, Quad pillar - 3 ISSPRO gauges (trans, pyro, boost) and DP-Tuner F6; Roush fuel pressure / temperature / oil pressure gauges, Ford Severe Duty AIS, 31 row 6.0 transmission cooler, ScanGauge II, Marinco mod, Walker BTM