2013 Prius. Sometimes I get an odd noise when the ICE kicks in. I want to check if there is an issue with my engine mounts. I know the mounts can be good and there still be noise.
not sure if gen 3 is exactly the same: motor-mount-inspection.191500 there's a tsb in post #1 that might be helpful replace-rear-engine-mount.225919 a gen 2 video watch
Attached is the full engine section. I believe around 115 page engine mount info starts, but look around too.
Sometimes your symptoms are caused by a failed headgasket... If you open your coolant reservoir and hear air sucking in as it opens that confirms this is the cause of your symptoms.