A scanner, either yours or the ones auto parts stores let you use for free, will tell you if there is a code set for front or rear O2 sensor. Most times it is a vacuum leak, not the sensor.
The link to Volvospeed shows how to replace your own front O2 sensor, rear should be similar. You can use a 22mm box wrench if you free up the wire first and thread the wire through the box end. I suggest spending the extra bucks for a 6 point wrench from Sears or some other reputable company, not one made in China which is too thin.
Klaus
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The 164 has a new home, all I am left with are a 95 854T and a 98 V70R :)
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