When you clear the cell their is a record of it and will report as not ready. Most states will allow 1 or 2 not ready statuses. Also I believed the OBD2 system will hold I formation that you cleared a cell until you complete a full drive cycle.
2001 ZX3 Zetec - Rebuild "The TICK" (
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2004 ZX5 SVT - Restoration "Code Name Rocket" (http://www.focusfanatics.com/forum/showthread.php?t=722698&referrerid=62897)