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How to fix PO420 code (Cadillac)


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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.

Bruce

2023 Cadillac CT4-V Blackwing

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Be careful spraying penetrating oil above yourself while lying under the car so you  don't get blow-back in your eyes.

Bruce

2023 Cadillac CT4-V Blackwing

Follow me on: Twitter Instagram Youtube

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