FORD 2004 Focus v.1 - Manual (Page 146)

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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2004 Focus (foc)
Owners Guide (post-2002-fmt)
USA English (fus)
Roadside Emergencies
146