DTC P0420 Or DTC P0430: Condition

DTC is set when value from HO2S No. 2 becomes closer to value from HO2S No. 1 at either bank. MIL is illuminated when ECM (PCM) detects malfunction during 2 consecutive drive cycles. Possible causes are:

• Catalytic converter malfunction.
• Exhaust system leak.
• HO2S No. 2 malfunction.
• HO2S No. 2 circuit malfunction.
• ECM (PCM) malfunction.