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Will a code po455 show if car has bad catalytic converter?

Yes, a code P0455 can indicate that the catalytic converter in a car is bad. The code suggests that the car is running with an extremely rich fuel mixture and that the catalytic converter is not able to properly convert the pollutants in the exhaust gas to less harmful substances. This can happen when there is an issue with the fuel injectors, oxygen sensors, or other parts of the fuel system that cause the engine to run too rich.