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


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.

  • 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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