Just, bring it into the shop. I can pre scan it to make sure it’s ready to smog. Yes, I can fail smog when you change out the battery due to readiness monitors not being completed.
Yes for older vehicles it will fail. You would have to drive it for a week or more than 100 miles to be sure everything reset for testing.
I don't think so but I don't really know so it's best to ask someone before you do that
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