Hi Dave

Given the fact that your problem got worse gradually over a 20 min period I would think it is fair to say that it did not drop into limp mode, at least not initially. In my case with my Ford Fusion when there was a throttle position error detected the car went straight into limp. So perhaps in your case the throttle position sensing is not the problem.

On the subject of not being able to connect this intrigues me. I was in the exact same position when I first bought my present Morgan in that nothing I tried would connect but I knew that MMC and the dealers could. For a long time I came to the same conclusion as you that MMC had locked accesses to everything except their specialist diagnostic software. As it turned out after a lot of reading and searching this was not the case. What MMC had actually done is fitted an EEC that was long out of date and used a Ford only and now obsolete protocol known as Ford DCL which falls into the category of OBD1. I don't suppose you can blame them for getting rid of old stock on cars that were not destined for the USA where in 1999 when my car left the factory the car could not be sold legally. When you mention dealers and MMC can access the port there are in fact at least four ports wired to different pins on your diagnostic socket. These ports handle a range of different protocols and speeds I know of at least eleven variations. Even the very cheap and simple OBD2 readers will scan through all these ports and options on initial connection until they receive an intelligible response. I know all this dreary stuff from trying to work out why my car would not connect. Anyway I am confident that BHM will resolve your issue. I know that really this is none of my business but if it's not too much of a cheek I would love to know for my own education if they can confirm that all but the inner sanctum are locked out of these GDI cars.

Regards

Tony