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http://www.autocats.net/manual/chevrolet/tis0911/cis/Documents/Captiva-MY-2008/SM-C/8C2_1F14.EN.html
hope this helps.
could be catalyst related, googlr chevrolet captiva p1446 faults
pre catalyst temp too low during regeneration,
Go out and thrash it a bit, italian tune up!
Edited by: Oldroverboy