OBD2 Compatibility

Hell to all
Can anyone advise on Citroen 2003 C5 OBD2 compatibility or confirm that the generic OBD2 scanning tools will work with the C5.
From what I can gather so far, OBD2 is a standard and some reports suggest
that all cars from 1996 have met this, although this typically refers to the American market.
These tools are £50/60 each which is the cost of a single read from a garage. Buying one is then commercially viable as it can be used repeatedly but only if it is compatible in the first place.
Any advice would be gratefully received
Thanks
Andrew
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Petrol engines cars sold in the EU should be EOBD compatible from 2001, Diesel engines from 2004. However, this does not always mean that the cheap readers will work with all vehicles.
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like they were saying:

Nor does it mean that OBD standard readers will read every detail, only the basics.
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