Check http://au.geocities.com/ozbrick850/computercodesvolvo.html
It has the 231 and 232 codes and they apply to oxygen sensor. Your dealer doesn't have to have the codes present to diagnose the problem. They can test the oxygen sensor and determine if it's faulty. It costs approximately $300 parts and labour to replace one (your car has two) but it's probably just the front one that triggers the codes. But if your car is still under warranty I wouldn't worry. Just tell them what the codes were, get a work order opened so if your warranty expires you can still have a chance to get it replaced free of charge if testing doesn't find anything.
happy testing :-)
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