The trouble code definition I am finding for the Ford OBD-II System is:
P1247--Turbo Boost Pressure
P1247 Turbo Boost Pressure Low, this can be caused by a defective waste gate or a leaky exhaust or a defective turbo.
Low Turbo boost. Unfortunately it probably won't be a cut & dried solution but check all vacuum lines etc for cracks, kinks, breaks to start with. I'd probably start looking for an experienced mechanic in diesel engines & turbos, just in hopes that they will have experience in that area.
SOURCE: diagnostic code meaning
Low boost. Here's a detailed forum explaining several techniques for trouble shooting.
http://www.powerstroke.org/forum/99-03-7-3-motor-problems/60995-engine-code-p1247.html
SOURCE: diagnostic code meaning
P1247 means the Turbo Boost Pressure Low, this may be a turbo issue or a defective waste gate.
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