Just bought a 2.5 diesel v6 quatro.
Was told the pump edc unit has give up.
He said it was running fine and went into limp home mode.
took it to audi and came up with pump problem.
they removed the power boost kit and reset the ECU.
ran fine but after left for a couple of hours it reverted back to limp home.
audi tried the ecu reset but still in limp home.
Hope some body can help with this problem.