The part has been tested with a multimeter and found to return low voltage to the ECM. I am sure they are not all defective but the one I received was. The sensor was installed by a certified mechanic and code P0102 appeared as a clock every 3 key cycles. The Cats are brand new so he used a multimeter to check the voltage going from the MAF to the ECM and it was overkill. Pity!
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