Can someone explain please the 4SNS/1/40000000 error code: TMOP - 127.875 and how to solve the problem?

AHT error code.

You have problems? Why do you run Apple hardware *?

Of

http://www.CNET.com/news/how-to-invoke-and-interpret-the-Apple-hardware-tests/

which would indicate a bad sensor on one of your memory modules or riser:

In the case of an error in probe (4SNS), to determine what type of sensor is referenced, look for his first letter, which should be 'I' for the current "V" or "T" for temperature, voltage.

Then check the second letter from the list below to see which component it refers to:

A: ambient air sensor
B: battery
C: Central processors (CPU)
D: DC (direct current)
e: PCI-express slot
F: FireWire port
G: graphics processor (GPU)
H: drive
h: heat pipe (heat sink)
L: liquid crystal display
M: memory or the memory riser cards

I would first install a monitoring app like Mac Fan Control of temperature

http://www.CrystalIDEA.com/Macs-fan-control

to see of you can find a bad sensor by reading the memory riser card.

You have a MacBook Pro as indicated: MacBook Pro, OS X Yosemite (10.10.5)

Since this is the Mac Pro desktop forum

Tags: Notebooks

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