A MAF should last for quite a while. Replacing the MAF is easy, but I'll be more worried about what caused the MAF to malfunction, or what the malfunctioned MAF has done to everything else in the system downstream of it. I had a Honda Prelude with a bad MAF (bad wiring) when I bought it. It was running, wasn't throwing codes that often, but it destroyed all the spark plugs and the catalytic converter, as well as the EGR valve because the car was running rich for too long.
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