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Sounds like something completely unrelated to any of the work you did. Disconnecting the battery will reset the computer and it must relearn settings again, so it is possible this caused a little confusion for the computer.
It could be an MAF or Oxygen sensor, or else it could be one of the spark plugs or coil packs. If the light has gone off, personally I would ignore it and adopt the wait and see approach. If you are really concerned then take it to a garage that can read the codes for you. Ultimately, these things rarely go away by themselves and it will be back sooner or later.
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