PLEASE HELP: where is the ambient air sensor on MBP mid 2012?

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Level 1

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PLEASE HELP: where is the ambient air sensor on MBP mid 2012?

I have a 13 in. MBP mid 2012 and the fan runs crazy all the time. I did reset the SMC but it didn't help. When I check temp. CPU and everything is fine but the ambient temp. is 102 !! I ran apple diagonistics and it gave me the 4SNS TAO error which is to do with ambient air sensor. the only issue is that where is the ambient air sensor located? How can I fix it and what should I buy. Is there anyone who can help me with this? I searched google and all but there was no answer. I cant afford to have the thing fixed by Apple and I really need help. I use this Macbook for work.

I think I should mention that I changed the ram to 16gb and HDD to SSD a couple of weeks ago if that is in anyways related.

MacBook Pro, OS X Yosemite (10.10.3)

Posted on May 26, 2015 3:35 PM

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Answer 1

Sep 25, 2017 1:49 PM in response to armin73

So - did you get an answer? I have the same issue here: Can´t find the sensor. What do I have to replace? The optical drive module, the trackpad, something else?

Any help highly appreciated. Thanks a lot and best regards, Matt.

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Answer 2

armin73 Author

Level 1

1 points

May 27, 2015 3:50 AM in response to armin73

please anyone?

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Answer 3

Cunnla

Level 6

8,257 points

May 27, 2015 4:07 AM in response to armin73

How did you check the temperature?

The error code indicates that a temperature sensor has failed, which may cause the fan to overwork.

It is unlikely that you can fix it yourself, unless you're highly proficient technologically. I would take it to Apple for a free evaluation. Apple - Support - Search

In Activity Monitor > CPU, are there any processes hogging the CPU?

Also, try starting in Safe mode by holding down the Shift key while starting, and see if the fans are overworking there.

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Answer 4

armin73 Author

Level 1

1 points

May 27, 2015 4:16 AM in response to Cunnla

I don't think it has to do with the CPU because I checked that. DO you think the ambient air sensor is the one attached to the HDD cable?

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Answer 5

armin73 Author

Level 1

1 points

May 27, 2015 4:19 AM in response to Cunnla

I checked the temoreature using a third party app. ALso, when I run apple diagonistics I get that error about the ambient air sensor.

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Answer 6

Cunnla

Level 6

8,257 points

May 27, 2015 4:29 AM in response to armin73

DO you think the ambient air sensor is the one attached to the HDD cable?

I don't know. However, if this started happening after you changed the RAM and startup disk, maybe you should open up the computer again and make sure all the clip in connectors are secure.

Also, when you touch the computer, does it feel very hot?

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Answer 7

OGELTHORPE

Level 9

57,305 points

May 27, 2015 4:30 AM in response to armin73

Your only practical option is to make an Apple store genius bar appointment. The evaluation will be FREE and then you will know exactly what is the problem.

Ciao.

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