CORRECTION:
As I was driving out to my Volvo dealer at lunch to pick up some bushings, I realized one of the tests I suggested might not work.
If you pull the connector from the computer, I'm not sure if the shield on the green wire still has a ground. I'll have to look at a wiring diagram to see if the shield is grounded through the computer, or if it is still grounded through the wiring harness.
Therefore, to keep things simple, check for a short between #5 and #24 directly at the computer plug (with the O2 sensor disconnnected), not at the green wire to chassis ground.
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