I checked my OBDII information using my laptop and Harrison R & D software; failed the closed loop test; The front O2 sensor shows the classic cyclic waveform between about .1 and 1 volt; the rear sensor is a flat line stuck at zero. I seem to remember someone indicated there was a fairly-priced Ford replacement for less money that would work in place of the OEM.
I also understand the sensor is recessed in it's mount and requires a thin wall socket to remove. God! Sometimes I hate Volvo for trying to force drivers into their over-priced shops, but that another story!
Has anyone found a good price on a replacement? Anyone got any tips on replacing the sensor?
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