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On my 2002 F250 7.3 I kept getting 2 codes when pulling my 5th wheel uphill.
P1247 (Turbo Boost Low)
P1211 (ICP pressure above/below desire)
I changed the ICP and took my truck to a shop to diagnose turbo problem. They concluded that the HPOP was bad and needed replaced. I replaced the HPOP and now my check engine light turns on and off during normal driving. I don't have a code yet but was wondering if I missed something in the installation?
I drove around for about 40 miles or so then reset my computer. So far the check engine light has not come back on. I am hoping that it was just air that was still working it's way out of the lines. I will update later.