Q: about my van. on 2001 Chevrolet Venture

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I just asked a question about my van and it definetly got screwed up. My question was right until the part where I was talking about the computer gadget that I had rented from auto zone that you plug up under your dash and codes would come up telling you what was wrong. Well it said that nothing was wrong with my van so to make sure this device was working right I had my sister to plug it into her car and 3 different codes came up! So yeah I'm completly lost,need a vehicle and don't no what to do because remember I smelled gas when checking my oil. So does anyone have any ideas??? Please,please,please help me. Thank you, good or bad news cause I have no ideal...
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