Final Update (I hope)

Finally the X is back. The DDE 7 unit (Diesel Engine Management) has been replaced and installed (part cost £1050 plus fitting and diagnosis). All seems to be working ok so far.

It looks like the sensors were all ok just the part linking them all together and making the decisions was faulty.

An expensive repair but at least I haven't spent months changing sensors and injectors and gearboxes guessing what the real problem was.

I hope my experience will help others.

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Oscar