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P0420 Catalytic Converter Code

   
Old Apr 12, 2024 | 04:18 PM
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Default P0420 Catalytic Converter Code
I tried Rislone Cat Cleaner, STP 1 Tank Tuneup and Lucas Fuel System Cleaner and removed the code with my scan tool but the code came back right away after driving 50km.
The car sounds way better and is performing very well compared to before.
Broken oxygen sensor or the cat done?
 
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No upshift or downshift


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