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Apple AHT Error: 4SNS/1/C0000008: THSP— 124

My MacBook Air (mid-2012, A1465) recently started running very slow. Activity monitor show Kernel using >300% of CPU. Running the AHT consistently gives the following result:

Alert! Apple Hardware Test has detected an error:

4SNS/1/C0000008:  THSP— 124

I have reset NVRAM/PRAM as well as SMC and done a clean reinstall of OSX. None of this made a difference.

From what I have found on Google, this error indicates a bad temperature sensor at the hard drive (SSD in this case).

I’m wondering if anyone knows where this sensor is located. Is it on the system board or on the SSD drive module. I’m hoping it’s on the SSD and that replacing it will also replace/fix the temp sensor.

Any advise on how to fix this problem would be very much appreciated.

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THSP— 124 is Thunderbolt sensor. Without knowing your specific board model, I assumed it’s 820-3208. You want to check Q5520, R5540, and R5541. One of these components is likely at fault, causing the error code you’re seeing as well as the slowness. You will need a schematic and boardview of your board version as well as a multimeter and soldering equipment to troubleshoot/fix this.

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Thanks for the info. I'll have to see if I can find a schematic for the board. Luckily I have soldering equipment and multimeter. The quest continues! ;-)

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Q5520, R5540 and R5541 do not exist on my motherboard 820-2915-B

I have the same error code 4SNS/ 1 /C0000008: THSP- - 124 on the motherboard 820-2915-B Macbook Pro 15 "A1286 2011, can you tell me, which component and which resistance should I check

Thank you in advance

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