2.6 GHz dual-core Intel Core i5 processor (Turbo Boost up to 3.2 GHz) with 3 MB shared L3 cache.

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How many heat sensors and where are they?

I have a macbook pro which appears to have a faulty heat sensor fans on full at start up and apple hardware test throws out the code to indicate this.

Is this replaceable? or is it integrated on the logic board?

Or part of the fan cables?

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Try using this app Temperature Gauge Pro. It will show you the different sensors and show you what the fan is doing.

As for AHT heres a good writeup on what the errors mean How to invoke and interpret the Apple hardware tests

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