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My car is throwing two cels P0402 catalyst effeciency below threshold....bank 1....P0402 Catalyst effeciency below threshold bank 1... why is it throwing the same code twice it this o2 related or is my catalytic converter s**ting the bed? If my catalytic converter is done for its just an excuse to do an all new exhaust because if I need one of those 3 cats replaced I'll put 2 high flow cats one on each bank than a mid mount muffler, straight pipes and maybe or maybe not mufflers in the stock location after I hear it both ways. Also if I do it that way are the rear 02's going to throw a code? or will they be ok if I weld o2 bungs for them behind the new cats?



Please give your input if this is 02 related I guess I'll just buy new again
 

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It's either the cat or the rear o2 sensor. You can turn the rear o2's off in a tune. If you need them for inspection then placing them behind hi-flow cats will work fine.
 

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Yes, 402 is "Exhaust Gas Recirculation Flow Excessive Detected"
 
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