2001 Hyundai Elantra Had Engine Light Come On Off Last 3 Months Came Again Today

2001 HYUNDAI ELANTRA
850,000 MILES
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Had engine light come on and off for last 3 months came on again today so pluged it in came up with u0004 I know what the code means but dont no the cause and dont no how to fix the prop the car runs fine when light comes on and doesent effect performance at all anyhelp would be greatfull thanks
Apr 5, 2013 at 3:47 PM
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