After checking for a non start, called the RAC out. 3 hours later he arrives, turns the key and the b@stard thing starts. Did a scan anyway and came up with DTC: P214600,Fuel Injector Group A Supply Voltage Circuit / Open. 

No more details and he was on his way. So an intermittent issue with an injector or harness it seems. Got to love an intermittent fault...

So much for the Porsche thing, at least the RAC machine has given you a starting point.  Get your magnifying glass out and full human senses diagnostics, eyes, touch, ears, nose, taste (some can also be used for detecting drinks and food breaks).  Sod's Law whether you start at injector or battery ends it'll be nearer the other.  Usual check all wires and connectors are clean, secure and protected and go from there.  Good luck.

 

Edited 22 March, 20233 yr by nta16
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Quick update. Checked all the wires and plugs as best I could but nothing obvious. No pinch points or harness clips broken either. I have taken the car to and from work the last couple of days and no problems, running well. However it's always exciting when I put the key in to see if it'll leave me stranded 😂. Time will tell I guess.

If you dare you could try disconnecting any connectors to see if the connections are secure and clean inside, it also allows checking the underside of the wires, going from the injectors as far back as you can.

 

Or you could see if someone from this site is able to help you with plugging in a VCDS or similar scan device to see if more diagnostics information is available. - https://www.google.com/maps/d/viewer?mid=1Td73_uUUqscV3nRm5br_o89PmBU&msa=0&ll=21.259901462991746%2C83.39240985000004&z=2