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Looks like 93civicvx has a california emissions vx.They come with the 4 wire o2 instead of the 5 wire wideband. Also has different ecu. Maybe check the VIN# & ecu SN to confirm previous owner didnt swap something out. I can confirm that if you unplug a 5 wire o2 vx it will definately get worse gas mileage then being plugged in.
Last edited by robertsvx; 04-28-2011 at 08:26 AM..
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