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What would cause catalyst system efficiency below threshold bank1on a 2002 Monte Carlo ss Had catalytic converter replace 2 weeks ago?
Wiki User
∙ 17y ago
There is a possibility that your O2 sensor is fouled. The O2 sensor is what reads the exhaust air to fuel ratio. Have it checked..........I would have looked at a bad O2 sensor before i replaced a catalytic converter. There are some cars with O2 sensors before and after the cats, and others just have O2 sensors in front of the cats. I am not sure what you have.
Wiki User
∙ 17y ago
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