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Spraying the O2 sensor with a penetrant (not WD40) will probably do nothing for your mechanic as you will drive the car to him and burn up any of the penetrant in the process. He knows it is hard to get out and has probably done several hundreds by now.
If you really want to spray, the O2 sensor can be seen from underneath.
You might want to clean off the wire connector if you can find it. Look behind the air cleaner near the top of the transmission. There are two square connectors usually covered in sand/dirt.
http://volvospeed.com/volvo_repairs_how_tos/sensor_replacement/oxygen_sensor_o2.html
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Klausc, a Volvoholic
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