You may want to have a look at this thread, Captiva is the sister car of the Antara. It seems to point at theexhaust gas recirculation(EGR)
http://www.chevroletownersclub.co.uk/forum/engine-light-on-code-p02e1_topic453.html#.U5YGynJdXbw
This bit was interesting:
"Looks like the EGR valve on the Captiva is a common problem. The garage has told me they cant get one for over a week. Chevvy says they are supplying around 60 of these a week."