#ISTAT TEST ANSWERS UPDATE#
Update on my problems: Culprit was an incorrect current reading signal (Charger BMON according to iStat) coming out of the battery controller. Hopefully I am able to cut someone's troubleshooting time as I've been struggling with this all day. I will update with my bath results as soon as I have them. Perhaps the R stands for rectification? I don't know. I also suspect that the 'B' in 'BR' stands for battery. My problem came about from liquid damage so I am going to try an isopropyl alcohol bath tomorrow to see if that alleviates the issue. My computer will only boot up if the power button is held down and the chime is allowed to play, otherwise the sleep/power light briefly turns on and then off again. What's eerie is that my computer also exhibits the very high kernel task which is making me think a low-level interrupt handling is hogging up all the CPU time. I am experiencing the very same issue and this is as far as I've come to troubleshooting it. P, in this case, is associated with the "power bus", meaning there's an issue with a over or under-current somewhere in the power bus.
The article goes onto say that the second letter identifies the component.
You can read more about it on this great CNET article. In this case, we have a current sensor since the identifier starts with an I. To correct machead3's answer: 4SNS is not specific to a temperature sensor but can either be a current (I), voltage (V), or temperature (T) sensor issue.
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