abeln2672 wrote: ↑Sat Jan 22, 2022 9:34 am
For example, I wonder if I hooked up a multimeter to check the voltage of the battery whether that would definitively tell me it's failing or not.
If you have a 12 V battery charger, turn off the high-voltage disconnect and fully charge the 12 V battery. Then measure its resting voltage several hours after charging has completed. If it's above 12.6 V, the errors should go away if low 12 V system voltage was to blame.
You must wait for the high-voltage system to shut down before measuring the 12 V battery's voltage. To get a good resting voltage, I open the frunk after parking for the night and measure the battery's voltage the following morning before unlocking the doors. If the frunk is completely closed, opening it would start the high-voltage system, so don't close the frunk all the way. I recently replaced the original 12 V battery in our 2014 i3 after the resting voltage of its battery was only 12.26 V after fully charging it the previous day with a battery charger.
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