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i have some questions about my Macbook pro late 2011 nacOS High Sierra 8 gb ram with 750 gb HDD Q1: my mac performance slow, i do a test and got 2 codes 4SNS/1/40000000: VD0R-17.552, 4SNS/1/40000000: VD0R-17.546what does means these codes? Q2: why performance slow? do i need to renew window or anything else to make performance well. Q3: my 60W Magsafe adaptor not working correctly, so i bought another Magsafe adaptor that is 80W,will it harm to my macbook battery or there is no problem with it. 60W output voltage 16.5 80W output voltage 18.5 thanks Regards

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Using data from https://logi.wiki/index.php/Apple_Hardware_Test_(AHT)_and_Apple_Diagnostics_(AD)_Codes & other similar resources, I can see that 4SNS is a sensor error, then VD0R V for voltage, D for direct current, but I don't know which component might be 0R.

I'd say you need a repair shop.

The answers to your other questions will depend on the results of that investigation. On a 10-year-old Macbook I'd be more inclined to think the battery was failing than the charger.

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  • thanks for reply, but i recently change the battery. – Rana Rizwan Feb 15 at 8:06
  • Perhaps spmething was knocked while changing it, or maybe the battery isn't up to spec. You still need a tech to look at the sensor error. – Tetsujin Feb 15 at 8:09

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