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I have two sets of coils for the Nissan Maxima, the aftermarket coils were installed in the car and it presented code P1320 consistently. I removed the coils and installed new spark plugs. After doing some testing and comparing the data, I decided to install the old original coils and try them again with new spark plugs since one of the old plugs was fouled and I suspect the aftermarket coils are not compatible after seeing the very low resistance readings on the 2,4 and 6 position coils.