Code P0420 : Catalyst System Efficiency Below Threshold
This code is set when the o2 sensor behind the catalytic converter sees a lower signal than the set parameters of the OBDII system.
English : The Catalytic converter is no longer doing an efficient job and needs to be replaced.
Symptoms : Check Engine Light On
Drivability : Not affected
Causes :
1) Age
2) Running rich caused by failing upstream o2 sensor or failing MAF
3) Fuel Injector Stuck Open
Fix : Replace Catalytic Converter and test system
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