Hi all,
Just wondering if anyone has had any similar issues or can help with a matter.

My (UK) 2011 Panamera 3.0 Diesel starting idling rough a few weeks ago and the coil light intermittently started coming on. The car would go in limp mode when it came on. After a couple of days the car basically just stopped and refused to start. It was recovered to a garage where they diagnosed no fuel pressure and deteremined injector no 4 was bad and needed to be replaced. They replaced the injector and at the same time pulled out the other 5 and has them cleaned. Car came back all fine.

Two weeks after driving without any issues the coil light and engine light both came on again today and again the car started misfiring and restricted performance. Drove the car to a local garag and they plugged in a Snap-On machine and this time injector 5 (or its circuit) came back with an error. They swapped injector 4 (the new one) with 5, cleared the codes and started the car. The car still reported Injector 5 (or its circuit) faulty so they stated it wasn't an the injector but something else. When they started the car again the car actually drove ok for a few minutes before relapsing. This time the Snap-On machine reported:

P214900 | Supply Voltage For Fuel Injector B: Open Circuit
P020500 | Cylinder 5-Injector Circuit

Because of this they said it was probably the wiring or sensors somewhere which was basically beyond their scope.

Can anyone shed any light on this or can anyone recommend a Porsche specialist in Yorkshire/North West? I've had pretty bad experiences with the dealers so hesitant to take it to them.