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Check engine light goes away on opening and closing gas cap. But then keeps coming ag

1634 Views 1 Reply 2 Participants Last post by  happycamper, 
J
My Sienna 2008 has started showing check engine lights at 80K miles. I noticed that if I open and close the gas cap it goes away and comes back after 30 mins of driving or so. Could this be related to gas cap or just that check engine lights get reset sometimes by such action
Please help
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