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Fuel economy, rich or lean codes, IAT or MAF specific codes if it's bad. There's no reason to clean it under 90% of circumstances. They're good reliable MAF's that don't seem to be particularly sensitive as the hot wire ones are. Ours use the same principle but it's two resistors on a plate, one after the other that use the temp/voltage differential at both resistors to determine air mass.
 
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