Catalytic converter problems

Catalytic converter: Equipment in the exhaust system that transforms the contaminant gases radiated by the car.
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Emissions keep rising

Toyota Corolla 1999 Hatchback 80000 miles
After failing nct on emissions on my Toyota Corolla 1.13 new lambda sensor fitted & reconditioned catalytic convertor. Emissions shot up to 6.1, was my catalytic convertor better than the replacement ???
Barb from other 7 years ago  
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