lambda sensor for decat?

hazgaf241090

Member +
when removing the catalic converter there is 2 sensors bolted in the top sensor is a lambda sensor, there is another sensor lower down. what does this do? is it necessary. also the lambda sensor wire, is it allright 2 cut in half and resplice and crimb back 2gether because i have copper showing because of damaged wire insulation. so i wud like to re do it. harry
 
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