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Fix for this error code.. P0420 - Catalyst System Efficiency Below Threshold

Anyone experience this before? I am driving a 2008 Subaru Impreza hatchback. ?

Was told i need to change my O2 Sensors.. Anyone can advise how much it is or anyone selling used usable parts?

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uh, did you decat?


1. You can might as well decat and put a resistor

2. Put a resistor



I doubt is the o2. o2 error code will show that it is o2. o2 sensor not cheap.

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