Problems after battery change -2005 MMT

[tmontague]

Originally Posted by Brighton

Some cars just do that while others don't, its a manufacture specific thing. All cars have a preset learn procedure and they'll run closed (?) loop initially while they gather data and learn to run given the data from the cars sensors. Most newer European cars won't even run when you swap the battery if you don't keep the ECU powered during the swap. It's just how it is and when it comes to new cars on dealer lots, this is a well know thing in the auto industry and dealers will not deliver a car that isn't set up and ready to go, so they'll just have someone drive it around the block before handing the car off to the new owner.

Coincidentally I have noticed that letting my yaris idle for 20 or so minutes fixes the idle hunt issue from disconnecting the battery- it's possible that manufacturers or dealers let the cars idle for a specific amount of time without touching the throttle