Quote:
Originally Posted by DrFerry
Increased Emissions and Check Engine warnings are very often caused by a battery that might be on its last legs. See this video below to check the battery "health". Consider buying a battery tender to keep your AGM battery alive a bit longer. The E90 series M3 alternator does not charge the battery at WOT. Combine that with folks who drive with their lights on all the time and phones plugged in and your battery has a hard life. Consequently, if its steady state voltage drops low enough odd codes can be thrown.
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damn, my battery charges at 13.8-14.0. This guys in the video was 14.5, I wander if it's because my battery is older and alternator just adjusts the charge to the battery age!? anyone has any idea?