Compression Ignition Addict
Join Date: Mar 2006
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While you have not said tuned or not or how may miles, the obvious first call is the EGR valve sticking...
It could also be a sensor in the exhaust system, as when one of them goes you get some funny readings.
There have been a couple here in Oz, incidently the furthest rearward exhaust sensor seems to play up the most, a couple have been replaced...
But anyway, it sounds like the EGR sticking or one of those sensors to me, and the first place I would look.