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On my 110 HDi, there is a stray wire. It is long, thin, and black.

It seems to come out of the loom - on the passenger end of the cylinder head, just underneith what I am guessing is the coolant temp sensor screwed in the head.

The wire was crudely routed along to the fuse/relay box, was not inside it, just stopped short. There is no plug on it, and the end has been slightly stripped.

Any ideas at all where this goes? Obviously a lose wire on the loom may be putting my engine light on!

There was common fix in the early days of HDi's where the earth wire from the MAF and throttle pot would be separated to give a better earth and to stop it flagging the engine light - I'm not saying this is it but it might be worth checking out! and to be fair I think this earthing modification found it's way back the the ECU end on the left hand side

Other than this I can't really help