2001 Pontiac Montana Showing Code P0420 Replaced Cat Both O2 Sensors Plugs Wires

2001 PONTIAC MONTANA
137,000 MILES
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Showing a code p0420 replaced cat and both o2 sensors plugs wires seems to run good
Mar 19, 2013 at 1:29 AM
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JACOBANDNICKOLAS
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There are many things that can cause this code to set. Most times you won't notice any difference in the vehicle unless the converter is melting down. Then you will notice a loss of power. Check out the link I attached for specifics about causes and and possible solutions.

https://www.2carpros.com/trouble_codes/obd2

Let me know if it helps.
Mar 19, 2013 at 1:40 AM
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