Some BMC cards provide multiple sensors belonging to different entities but with the same ID. Only full name differs for these sensors. A good example is Dell iDRAC 6 card. Zabbix sensor debug output looks like the following:

7395:20180213:131244.993 Added sensor: host:'10.0.4.74:623' id_type:0 id_sz:5 id:'Temp' reading_type:0x1 ('threshold') type:0x1 ('temperature') full_name:'1(10.1).Temp'
7395:20180213:131244.994 Added sensor: host:'10.0.4.74:623' id_type:0 id_sz:5 id:'Temp' reading_type:0x1 ('threshold') type:0x1 ('temperature') full_name:'1(3.2).Temp'
7395:20180213:131244.995 Added sensor: host:'10.0.4.74:623' id_type:0 id_sz:5 id:'Temp' reading_type:0x1 ('threshold') type:0x1 ('temperature') full_name:'1(3.1).Temp'

Here you can see three 'Temp' readings which cannot be distinguished one from other easily.

Proposed and included patch stores sensors full name in the sensors list and adds a search function that finds sensor by full name, allowing to use full_name field values as IPMI sensor IDs.