Someone posted the following message and I would like to find out who it was to discuss their procedure for this fix:
O2 sensor part fix
Rod
11/15/01
I found a generic 4 wire sensor from Bosch at Auto Zone. Bosch #15717. Spliced it in, reset the check engine light and it fixed the problem. It cost $49.95 vs. $200 from Volvo. I couldn't be more pleased.