> Are you running the latest version of IOS?
>
> Likely they haven't bothered populating CISCO-ENTITY-SENSOR-MIB.

I am using IOS Version 12.2(55r)SE

According to the MIB locator on cisco site: http://tools.cisco.com/ITDIT/MIBS/MainServlet?ReleaseSel=2836&PlatformSel=276&fsSel=1292

CISCO-ENTITY-SENSOR-MIB should be supported. However there is no record with this mib in snmpwalk :(

Is it possible I have to somehow turn it on in the switch configuration?