The PO174 & PO171 go hand in hand. There is a lean fuel to air mixture. A disconnected vacuum line or if it has a hole in it. Check all lines make sure they are all connected and are in good condition. Air filter and air passages should not be blocked or dirty. The EGR differential pressure sensor might be bad. If the problem is not enough fuel, the underling cause may be a weak fuel pump, restricted fuel filter, leaky fuel pressure regulator or dirty fuel injectors. Usually a vehicle with 60,000 miles or more.Hope this has helped give you some possible cause to look at. Happy motoring!
I would say that P0171 and P0174 is probably a vacuum leak so check all your vacuum hoses, (listen for any hissing). The P1000 code I think means that the engine managment system checks have not been completed. It might go away when you find the leak in the vacuum pipes.
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