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Originally Posted by Dale_K
If you only need to clear the code and nothing else you could just disconnect the battery. In fact that might be a good idea anyway for a MAF sensor issue because you want the car to discard all its previous fuel trim adaptation values. Sometimes clearing the code with a scanner will do it but disconnecting the battery is guaranteed to force the car to relearn.
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I would never recommend going that route; "dump" clearing of codes often leaves you knowing less than you did when you started. First, with out knowing what codes are involved, you are flying totally blind and trying to diagnose the car based upon guess work rather than facts. Often, there is more than one code, plus underlying "pending" codes that taken together will point you in a different diagnostic direction than you had planned.
We recently had a car in the shop who's owner had repeatedly replaced several different and expensive components in an attempt to end a persistent CEL; all without ever running a scan on the car. We scanned it, read two codes, did a $65 repair, and the CEl had not returned; and our bill was a small fraction of what he had already spent.