Yep.......you guessed it. I get there and no-one is home, I pop to my sisters around the corner in case she has a key, she is not at home. I contemplate the situation for a bit, and then they all appear together! I get the oil filter wrench, say my goodyes and drive home. Except I didn't. I broke down a bit further down the road, without my mobile phone!! What it made it worse, is my dad had done almost exactly the same thing the day before with my brothers Saab, I should have know better!! Just so has it he was on his way out again and passed me!! A quick bridge of the DME relay and I was back on the road, and back to finish my oil service! Have checked the relay out today, contacts all good, solder joints all good. Primary coil seems to have high resistance, (270k iirc) so I suspect the resistor that is in parallel has failed - the secondary coil measures 70ohm and pulls in fine. I started to remove the coil assembly to get to said resistor, but our small iron is struggling to keep it hot enough to get coil assembly out. Phone up Porsche, they have one of the shelf, but £62 - no thanks!! ECP it was for less than half that!!