Humberto,
I don't know how much the factory Volvo O2 sensor would be but I just put in a single wire (unheated) O2 sensor in my 1984 Pontiac Firebird. It was $29.95 with tax and came with the correct connector. The three wire sensor for a 1994 Volvo 940 Turbo can be ordered from Advantage Auto Parts for $192. I'm sure yours would be comparable if it is a three wire.
I haven't checked about the factory Volvo part but hopefully they haven't decided to use a "special" sensor at a "special" price.
Greg
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