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Con- Some pre 1996 vehicles did this to prompt you to change your O2 sensor(s) at 90Kmi intervals. Dealers probably made alot of money at this!! :evil: All you had to do was move a screw/jumper on the back of the instrument cluster to reset the O2 sensor dash light (every 90Kmi). O2 sensors of today can go way past 100Kmi + our nice & complicated OBDII system will clue us in if it detects any issues with any one of the four O2 sensors on 1996+ zu's :roll:


(Ooops! Sorry TAD.. you beat me too it!)
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