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The leading cause of a catalytic converter failure is a bad Oxygen Sensor, or ignoring your vehicles poor running condition. So if your vehicle begins to run rough, or the CHECK ENGINE light appears, have the vehicle checked out immediately by a professional technician. Further symptoms of a faulty or failing catalytic converter may include; failing an emissions test, increased engine temperature, bucking and engine hesitation. # Here are just a few of the signs and symptoms of a plugged/dead cat: # Markedly decreased low rpm power, # Engine runs a little hotter than normal at constant cruising speeds, # Exhaust leaks near header that won't seal in spite of new gaskets, # Bucking or hesitation while accelerating, # Cat's exterior surface temp cooler near outlet.

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Q: How can you know if the catalyc converter needs to be replased?
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