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Kia Sportage 2008 V6 2.7L
Code P0420 – Catalyst System Efficiency Below Threshold (Bank 2) – OBDII SCANNER says bank2 not bank 1
I check the REAR catalytic converter and indeed I heard a rattling noise, but no oxygen sensor is connected to this converter.
I checked voltage of sensors in both banks –the sensors 2 in both banks are both nice and constant around 0.5V – so good.
Can this bad REAR catalytic converter cause this code?
 
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