There is no way of measuring fuel pressure on diagnostics. Check the connections to number four injector, if the lamp is on but engine still runs with an apparent loss of revs and power (Limp mode) that could have failed. Or the MAP sensor on top of the fuel filter if failed could give the same symptoms..
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Then with due respect, i suggest you find out. We can then work from there.
That is the sensor on number four injector that i mentioned earlier check the connections to it, if connections ok replace it. Nothing to do with fuel pressure, it monitors start of injection for pump timing advance function.
No, there maybe a saved fault code but it should not effect the operation of the new unit.
Island 4x4 are cheapest for a new one as far as i am aware.
