NHTSA Complaint #11109513 — 2014 BUICK ENCLAVE

I HAVE A P0420 CODE ON MY 2014 BUICK ENCLAVE FOR ABOUT A YEAR NOW. ALMOST EVERYTHING RELATED TO ENGINE PERFORMANCE WAS REPLACED BECAUSE NO ONE COULD BELIEVE THAT THE CATALYTIC CONVERTER WENT BAD - EVEN AT THE DEALERSHIP - ON A 4 YEAR OLD CAR WHERE THE AFTERMARKET CATALYTIC CONVERTER HAS A 5 YEAR WARRANTY. I SPENT OVER $2,000 SO FAR REPLACING ONE THING AFTER ANOTHER AT THE DEALERSHIP'S ADVICE BECAUSE THEY DID NOT EVEN KNOW THE REASON FOR THE FAULT. NOW I KNOW IT IS THE CATALYTIC CONVERTER BECAUSE THE EXHAUST STARTED SMELLING BAD WHENEVER THE CAR IS RUNNING. GM/BUICK SHOULD INVESTIGATE WHY ITS CATALYTIC CONVERTERS ARE FAILING AND FORK THE BILL ON FIXING IT.