Olfactory sensor

Olfactory sensors are a sensor unit used to detect the scents of others. It is very common in animal based Transformers. Ravage possessed one of the most powerful olfactory sensors.

Fiction

Beast Wars

After the Great Upgrade from Autobot to Maximal, olfactory sensors were included among sensor units. Silverbolt had impressive olfactory sensors. When Ravage entered the Axalon, he was able to smell Ravage, but was unable to pinpoint exactly where he was. The Agenda, Part 1

While searching for Cheetor, Waspinator detected him, saying he caught the stink of an "unnatural"...present company excluded, of course. Later, Optimus Primal was able to smell Dinobot 2 coming. Feral Scream, Part 2

Very unique was that Depth Charge was able to smell the spark of Rampage. He commented that the newly born Dinobot 2 "stank of Rampage". Feral Scream, Part 1

Tarantulas had a distinctive odor about him. Dinobot said that it smelled like "vile corruption, a whiff of festering putrification". Interestingly, it smelled just like the limburger sandwich that Rattrap had just eaten. The Low Road

References

From Teletraan I: The Transformers Wiki, a Wikia wiki.