Chosen Solution
I have a Mid-2012 MacBook Air that is doing the kernel_text 600%+ thing. I ran the diagnostics and received this code: 4SNS/1/C0000008: Th1H—124 Everything I’ve read tells me that code represents the heat sink. Other articles I’ve read tell me that it is a heat sensor. This thread in particular dissects the code: Test give me this error: 4SNS/1/C0000008: Th1H - - 124 And this article talks about ways to get around the sensor: https://discussions.apple.com/thread/481… I am wondering something. If I go through the trouble of buying and replacing the heat sink, will that solve the problem? It doesn’t seem to me that it will, since the heat since does not appear to have a sensor component on it. It looks like just a heat sink: MacBook Air 13" (Mid 2011-Mid 2012) Heat Sink If so, then where is the sensor indicated in the code 4SNS/1/C0000008: Th1H—124? I can replace the heat sink, but if I can’t also replace the faulty sensor, I won’t have achieved anything. Thoughts and insights are appreciated.
You’re right, there’s no sensor on the heatsink, avoid wasting time and money on a replacement. Unfortunately there’s no physical sensor that can be replaced either, most likely it’s some component failure that needs to be troubleshooted. Either you’ll have to dive for some time into schematics and probing or get your board fixed by a lab into component level repairs.
The error 4SNS/1/C0000008: Th1H—124 on a Mac Air is a SMC chip error. Unlike a MacBook Pro which has a sensor your system does not. Here’s another person how had the issue and as you can see in pictures there was corrosion on the logic board: CPU throttling sensor error code: 4SNS/1/C0000008: Th1H- -124
