On my S70 (FWD) the front sensor is in the exhaust pipe close to the turbo. You must remove a heat shield to access it, between the engine and firewall. The rear one is screwed directly into the CAT. Access it from under the car. Both connectors are very difficult to access. They are located below the ABS unit, attached to a bracket on the transaxle. (designed for impossible access) You may have better access from underneath.
A tip. If you don't know where O2 sensors go maybe you shouldn't be doing the job.
Good luck.
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Tom 69-1800S, 72-1800ES, 96-850T,2000-S70 GLT-SE
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