Thanks bob12, I have a copy of the 2003 Haynes manual although it is very difficult to decipher the drawings in the back, and it labels it as LH2.2
If I switch the ignition off and back on the revs idle at normal and I've never had this fault code previously - plus the dashboard is the most recent thing I have disturbed so may well just need the contacts cleaning.
It mentions the blue wire in the Volvo service manual (green book) for the 240 I found on the net, which I why I wondered if it is the same. I don't know what signal the ECU expects to see.
I've cleaned everything up so will see how it goes, if not I'll look a bit further.
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