Your 1999 Volvo is a Front Wheel Drive Model. Maybe All Wheel Drive?
At any Rate, post again on the other half, more or less, of this forum at:
https://www.brickboard.com/AWD/
Also, post ALL the OBD fault CODES in your message.
ALSO, merely clearing the fault codes does not remove the cause of the fault codes and possible the cause of your failing an CA-state emissions test.
Ask the kind folk on the FWD / AWD section of the brickboard.com, and they may be able to help.
https://www.brickboard.com/AWD/
Cheers,
bastard Boyeeeeee.
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