I saw this post about the P0190 code. I have been having issues with the code popping up every once in a while. Back story, I replaced the fuel pump, with a Bosch because it would not start or hold fuel pressure at the fuel rail. It started fine and ran great. however, now I am getting that error code. I replaced the FRPS and EGR valve on two separate occasions. Still doing it. I checked for a leaky injector, but couldn't fine one. I did check my ref. voltage, which was at 5V. My scanner read 15 psi for fuel pressure, which I thought was probably wrong. But reading all these posts, I think my new fuel pump may still be the issue. My other thought was, it may be my vacuum lines or injectors. Other than that, the car runs great and has 191565 miles on it. Pulling my hair out, Advice? I have a video I took today with the fuel pressure at idle at 28 psi. When I turn off the car, it drops almost back to zero in about 30 seconds. But I cannot attach it. When I turn ignition on it goes up to like 20 psi. The freeze frame may be wrong, but why the pressure drop?
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