Crank re-learn

[spogshd]

Fitted the ATI balancer thinking i would need to do a crank re-learn.
My friend fitted one and the code came up crank re-learn needed, but mine never asked for one, why was this, one did and one didn't, just curious.

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[Genxer]

My car wanted a crank relearn after a simple tune. Both times I did it. Other people haven't had that issue. I'd love to know what precipitates this to pop up.