Ford 2009 Mountaineer Owner's Manual page 742

Roadside Emergencies
4. Remove the jumper cable from the positive (+) terminal of the
disabled vehicle's battery.
After the disabled vehicle has been started and the jumper cables
removed, allow it to idle for several minutes so the engine computer can
relearn its idle conditions.
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2009 Mountaineer (mnt)
Owners Guide, 2nd Printing
USA (fus)