Apple Hardware test "ERROR 4SNS/1/C0000008: TBOT--124"

I suspect that your problem is with the battery. A 2011 MBP battery would have far more than 8 cycles in 5-6 years of use. What is the source of the replacement battery, Apple? If so, they are warranted for one year. If it is a third party battery, some one may have installed a defective counterfeit.

Your best option is to have the MBP evaluated at an Apple store genius bar or an Authorized Apple Service Provider. You are dealing with hardware issues.

You may try a SMC reset, but I doubt that will solve your problem:

https://support.apple.com/en-us/HT201295

Ciao.

Your English is just fine--many levels better than my Portugese to be sure!

That is indeed a battery temperature sensor. It is possible that whoever replaced the battery and logic board failed to connect something. Unless a wire is loose, sensors are not typically user-serviceable, often being integral with the logic board.

A bad battery sensor could also be due to a sub-standard aftermarket battery, too. Those are all-too-common because Apple does not sell MBP batteries unless they install them. We "Average Guys" cannot buy an official Apple battery for installing at home. If the battery is in Apple packaging, it is counterfeit.

I recommend you return the computer to the seller and ask that he either fix it as his expense or refund your money.

Open System Information>Power and post this from your MBP:

Make certain that the charger is connected.

Ciao.

I think Allan Jones has given you the best advice "I recommend you return the computer to the seller and ask that he either fix it as his expense or refund your money."

Ciao.