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My acura mdx 2011 has been giving warning signs of battery replacement even when the Battery is ok as well as the alternator.
at times the battery indication flashes at times
 

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I had a "check charging system" light on my 11 MDX when I purchased used back in 14. The dealership did a firmware update and that corrected the issue. The only other time I got a warning was when my OEM battery was slowly giving out after 4 years in the vehicle. Replaced it with Interstate and zero warning in +5 years.

You might have to take it in to check your cables for corrosion, load test battery if you are +4 years, alternator output voltage, and ground wires.
 

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My acura mdx 2011 has been giving warning signs of battery replacement even when the Battery is ok as well as the alternator.
at times the battery indication flashes at times
Hi, did you get a solution to the problem you were having with your mdx? I am currently having same issue even after replacing altenator and new battery.
 
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