Peter Mutlow
Not a lot to go on here and I fear that you are opening yourself up to a bit of criticism from other techs. However, will try to help. Was the test at fast or natural idle? Can you scan/scope Lambda Sensor? Would like to see gas figures for both natural and fast idle. My initial hunch on the limited info provided would be Lambda sensor with possible Cat damage.
Regards
Pete M
Message Thread 
VW Golf GTi 2.0 APX - Emission failure, 12% Co, fault code P1582 - Fixed # - Nick Grocock July 10, 2010, 2:00 pm
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on July 10, 2010, 2:48 pm, in reply to "