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need help with my exhaust my ck engine light came on it its reads.P0430 catalyst efficiency low bank and p1637 generator L-terminal circuit.and my car has 122854 miles on her. what i did with my cat converter is gutted it out cuse it was just broken from the inside.so what else can i do to fix this problem and the second code what do i have to do to fix that not sure how much of a problem this p1637 is thx