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This could be as simple as a fuel filter change or fuel inlet metering valve ( this sits on the back of the fuel pump.) If your fuel filter hasn't been changed for a while and is dirty the ecu will tell the the injectors that it needs more fuel pumped through and would account for high pressure. It is suprising how many problems are caused by fuel filters and this is where I would start. Have you tried clearing the fault ? sometimes the rail sensor can be faulty too
 
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