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i have bmw 530d 2002 the car sometimes won't start had a diagnostic the fault code came up 1260 presupply pressure monitoring 09f6 rail pressure monitoring on engine start
any ideas would be of great help
 

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My first choice would be change the fuel pump relay behind the glovebox, it's only about £10.

When it won't start, you don't hear a click or pump noise when you turn the ignition on do you?

Then when you do turn the ignition on and hear a relay click and a pump whirr it starts yes?
 
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