Go to this website for lots of information on codes and vacumn leaks. 232 is a fuel trim, 435 is a front 02 sensor, I don't know about the other.
http://www.volvospeed.com/maintence.htm
Another good site is:
http://au.geocities.com/ozbrick850/
On the ozbrick link there are several tables of codes for different systems.
Sounds like your problem might be a vacumn leak. Check the elbows before spending the money on 02 sensors.
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Erwin in Memphis, '95 855t - fast & comfy, '86 Guzzi LeMans - fast & loud, '76 Montesa 348 Cota - slow.
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