P0420 CAUSES – Catalyst System Efficiency Below Threshold (Bank 1)
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P0420 CAUSES – Catalyst System Efficiency Below Threshold (Bank 1)
Catalytic converter cleaner: https://amzn.to/3CZgXER OBD2 Scanner: https://amzn.to/3PHRplS The P0420 code appears when the Engine Control Module (ECM) detects that the catalytic converter isn’t working as efficiently as it should be. The catalytic converter’s job is to reduce harmful emissions, and if it’s not functioning properly, it can trigger this code. But why would this happen? Watch this video to find out!
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Catalytic converter cleaner:
OBD2 Scanner:
The P0420 code appears when the Engine Control Module (ECM) detects that the catalytic converter isn’t working as efficiently as it should be. The catalytic converter’s job is to reduce harmful emissions, and if it’s not functioning properly, it can trigger this code. But why would this happen? Watch this video to find out!

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