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      01-19-2013, 06:18 PM   #14
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Drives: 2009 Crimson 328i
Join Date: Oct 2012
Location: Los Angeles

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Originally Posted by insane79 View Post
I went to the dealer with my car key & he checked it on the key reader & toke a print out & said the car battery voltage is 13.8v, even i was surprised hwo he can check it without checking the battery in front of him
The key reader stores a bunch of diagnostic info, including the battery voltage as of last removal. I forget why, but there you go .

For that matter, the car can check its own voltage, which you can read with an INPA cable. You can open the trunk and measure it with a multimeter, but then, hey, why bother.