A good diesel fuel injection workshop can change the sensor on the rail, I've had mine replaced, it's a bosch sensor. I was also throwing same code.
Mine turned out to be a broken ground wire from the TIPM to the sensor somewhere down next to the passenger side engine unable to be accessed. They hooked in a new one and bingo, readings normal again.
Try testing the fuel rail sensor wiring, there are a few good youtube vids that show you how. I found them after the repair. There are only 3 wires, 5volt, signal and ground (from bad memory).
All you need is a multimeter.
Good luck, i know how you feel re: where do you stop?.... injectors and fixed a smiley front diff this year.
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08 JK CRD
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