RobI
This all sounds familiar - I had the same problem and code a few months back.
I went through the process of:
* get all vac lines checked for leaks (vac test or smoke test)
* check engine pads for leaks
* check / replace turbo control valve (TCV) on air box (part no. 30611668 ~£30)
* check / replace turbo governor valve on front of engine block (part no 30637251 ~£110)
* last resort its the turbo
I had vac lines checked at an indy - all ok.
Replaced the TCV - still threw code. Apparently its also worth trying yet another TCV as they can be temperamental !
Replaced governor - cured!
Seems a new governor hasn't cured yours. Have you also changed the TCV?? More likely a cuplrit perhaps?
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