2005 mustang high fuel pressure problem.
Anyone out there have this problem. Check engine light on as well. Code p0191. I cleared the codes several times , then replaced the fuel rail pressure sensor on top of fuel rail. The reading on scanner went back to normal range running 39 to 43 psi.after one day the same code came back on p0191. Fuel pressure on scanner shows 79+.Now I am thinking maybe something wrong with the fuel pump or relief valve. Or maybe something else. Any help much appreciated.