Catalytic Converters
Oxygen Sensors
Chevy Monte Carlo

What would cause catalyst system efficiency below threshold bank1on a 2002 Monte Carlo ss Had catalytic converter replace 2 weeks ago?

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Wiki User
2007-01-10 17:01:17

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.

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