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Catalytic Converter Efficiency
here is where the story begins, about three months ago the chevy malibu came in with a code P0420 TWC system low efficiency (bank1). Both oxygen sensors and catalytic converter was replaced. So, now i have this car back with the same code. The P0420 is the onl... Login to read more. 
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| Engine | 3.1 L |
| Trans | 4-speed Automatic (Electronic) |
Vehicle Data
2002 Chevrolet Malibu 3.1L
| Engine | 3.1 L |
| Trans | 4-speed Automatic (Electronic) |
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