Thank you. This is working. I found one item that seems to be the fan. And then three temperatures (I don't know which temperatures exactly these are but they have all a similar value at the moment).
I ran into a similar issues creating custom sensors in our monitoring solution. I ran show environment temperature on the ASA and cross referenced with the values when I did an SNMP walk on the OID.
The 4 temperature values should be for the processor, chassis back, chassis front and chassis back left according to sho env temp. The processor value will be the highest.
snmpwalk with below oid
This is not working in my case.
CISCO-ENVMON-MIB::ciscoEnvMonTemperatureStatusTable = No Such Object available on this agent at this OID