PO420
Here we are replacing our (bank 1 sensor 2) downstream O2 sensor which has prevented the PO420 code from returning. The code would trigger within 5 minutes of the car idling and although the car still ran great before replacing the sensor it is nice to no longer have that CEL.
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How to repair a PO420 on a 2006 Nissan Altima with a 2.5 liter engine.You may not have to replace the catalytic converter with this easy repair.
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