Hello John,
How did you know that I have spoken to Lawrence?
Is the DPFE sensor the one on the back of the engine on what looks like the crankcase breather.Autodata doesn't show anything there & there isn't one fitted on the VW.
My foot didn't touch the pedal at 7.7 ms & the same increase in tp volts & drop in vac happened on both vehicles, but not as much on the top waveform. Lawrence thought that it was an odd fault, suggested rechecking for blockages or leaks & didn't like to suggest an ecu fault.He also said that the management system was looking for a difference in pressure before it operated the EGR valve ,but I would have thought that it was looking at the presure difference when it actually operated the EGR valve.Now that you have mentioned about what could be a DPFE sensor, I should think that it is most likely the cause of the fault.
Thank you very much for your reply.I will test the sensor on Monday, as I have got to go in now to get changed ready to go out & I'll let you know what happens.
Kind regards,Andrew