Wrong section... Will move later...
Anyway if you did it right a plug change wont throw codes unless something broke.
Did you rebuild the cops?
Did you triple check everything you unhooked or removed is back in place?
Did you check the plug gap before installing?
Did you properly torque the plugs to 12-15ft lbs with anti seize?
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2000 Mustang GT Steeda #0048 34k miles. 99 Cobra 4V swapped, FTBR IRS swapped, exhaust, tuned by James Gordon.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.