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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Yes, lights on at all times is really bad for your battery....
This is why we in countries where winters are harsh and it's mandatory to keep your lights on, always, everyone has their car hooked up to a charger and replace the battery every two months.
Just keep your lights on, will ya? People around here don't need any more crazy ideas for leaving their lights off.
If your battery gets in trouble by charging your phone it will have very serious problems getting your car to run.
