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@Deano1969 no need to create a second thread.

The quality of the replies you get is directly connected to the quality of the information provided.

I have not waded into this because you have thrown so many parts at it, there is no way to know what the original problem was as well as the problems you might have created.

If you think you are down to the C41 issue, read what the manual says about the error. The ECM controls the fuel pump relay and also watches the power to the fuel pump and injectors. The error is caused by the ECM telling the relay to turn on but not seeing power at the pump, etc. It also does the same if it did not turn on the relay but sees power at the pump, etc.

You need a schematic, voltmeter and some troubleshooting skills.
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