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It's an Emission Control Error Code DTCP0420: Catalytic System Efficiency Below Threshold
NOTE: If some of the DTCs listed below are stored at the same time as DTC P0420, troubleshoot those DTCs first, then recheck for DTC P0420.
P0137, P0138: Secondary HO2S (Sensor 2)
P0141: Secondary HO2S (Sensor 2) Heater USUALLY (but not always) it's an Oxygen Sensor that's bad. If they both check out okay you will probably need to have the catalytic converter replaced.
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After googling it is determined Code P0420 ( Catalytic converter effeciency below threshold)
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Trouble code P0420 means:Catalyst system efficiency below threshold
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P0420 Catalyst System Efficiency Below Threshold (Bank 1)
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