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Your code reader is just fine. Keep it. Do you really have a P0133? That is for the front O2 sensor.
Check out this thread for a 1997 850R, but relevent:
http://www.matthewsvolvosite.com/forums/viewtopic.php?f=1&t=18466
The vacuum elbow to the pulsation damper died.
There is also an 'unresolved' post which could be the result of not having the O2 wire extension:
http://www.matthewsvolvosite.com/forums/viewtopic.php?f=1&t=42838
If you have a P0136, along with your new sensor, try disconnecting the battery ground (radio code) for 20 minutes. Touch the brake pedal after disconnect to clear any static electricity. This will cause the engine computer to 're-learn' and you will need to drive the car for a while as the various systems get checked for errors. Your CEL should go out for at least a day or 2, if not longer.
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My back feels better when I sit in a Volvo seat
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