My daughter has a Focus and I know there are issues with transmission shift points for a while (about 15 - 30 minutes) after the battery is disconnected and then reconnected.
Also, the 2018 FMCA Towing guide says the 2018 Focus ST cannot be flat towed.
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Dave
US Army (Ret)
2020 Entegra Accolade 37TS
2019 Jeep Grand Cherokee Trailhawk (Toad)
FMCA - F432054
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