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I started the car up this morning- got the check engine light with the warning light, after 10 mins i shut the car off, turned it on again and both lights went away...this happened the same way the day before.....when the light was on my heat was not working either--- im assuming its a loose belt? im hearing no squeaks, but the belts are pretty new.
 

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check belts for good tension

what code did it throw
 

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is this still happening? i see you are bpu. if you adjusted your fuel curve you could also be getting super rich A/F ratios when cold and it may throw the CEL for an emissions problem. i would check the code like the other guy mentioned.
 
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