Not completely worthless... its like having a dummy oil pressure light that only lights up if to high it low vs having an actual swept gauge. Just depends on the level of information you want. Since a wide band is not all that much more than a narrow band it would be pointless to buy a narrow band, but not if it was give to you or was dirt cheap.
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)