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2009 2.5X EJ253 Manual
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2,802 Posts
Discussion Starter #1
How long does it usually take a 2009 to re-learn fuel trim, etc., after the battery's negative terminal has been disconnected and reconnected?
 

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2018 2.5i Premium CVT
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18,964 Posts
It varies. I've experienced times ranging from zero to a few quick starts to a day or two. In that latter case, things sure sounded ugly for a while.
 

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2009 2.5X EJ253 Manual
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2,802 Posts
Discussion Starter #4
I think its learned back in now. Right after the re-connect of battery, it was thrashy and impossible to smoothly shift (manual trans) for the first several miles. Seems back to normal now though.
 

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2018 2.5i Premium CVT
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Good news. That was exactly my experience on some occasions.
 
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