Motherboard manufacturers often connect different sensor features to circuits monitoring different things. sensors-detect has no reliable way to tell which sensor feature is connected to your CPU temp diode, your chipset temp diode, your ambient temp diode, etc. so it comes preconfigured with some wild-guess temperature.
TEMP2 sounds like it's just a bogus sensor--a sensor feature that the motherboard manufacturer didn't connect to anything. Its readings are probably meaningless.
TEMP3 is probably your ambient case temperature. I imagine TEMP1 is your CPU temperature. You can edit your sensors.conf file (usually in /usr/local/etc/sensors.conf or /etc/sensors.conf) and play around with it a little to change the sensor labels and alarm settings.
<pre>We now <b>return</b>(<font color=blue>-1</font color=blue>) to an irregular program scheduler.</pre><p>