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Maf sensors can get dirty esp if one is using a K&N oiled filter. remove the maf and look inside to see if there is any build up of dirt on the wire. If so used a little brake cleaner and gently clean it up. If this doesn't clear out the code then your maf is bad and will need to be replaced. You should be seeing a lot of black smoke comming out the back of you car with these two codes set as this is an indication of running rich.
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