Beetle Emission Warning Light

[perse]

My wifes 2000 2.0 has an emission light issue. It keeps coming back on after reset at VW centre. It has been in 4 times now, last time a coil pack was changed, previously a breather pipe was changed. It runs A1 when the light is on but she wants to sell it, apart from the usual timewasters that you get when you are selling a car I don't want to pass on a fault to a decent buyer!! Any help would be appreciated.
Cheers
Perse :aargh4:

[greas-E-monkey]

Do you have a print out of the fault codes, What parts have been renewed by the dealer ?