Vito 110 CDi (2000) EDC warning light

Whilst driving normally at 30 mph my van gave a little "cough" and the EDC warning light illuminated, but no other symptoms. In due course I
realised that I was in "limp home mode" with only 3000rpm maximum revs and no turbo function.
A Bosch injection garage diagnosed the fault (47.00) as a faulty fuel rail sensor which I promptly replaced (123.14), only to find absolutly no difference at all. On returning to the garage the mechanic again checked the system but still came up with the same fault, this time suggesting that the fuel regulator, main brain or even just a break in a wire could be the problem even though his 8500 diagnostic kit pointed to the fuel rail sensor, and was unable to say how much it would cost.
This is a very recent problem and the van seems to drive OK, subject to limp mode.
Has anybody had this or similar problems?
Many thanks
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