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Do You Need O2 Sensors Without Catalytic Converter?
You do still need the O2 sensors. Even if removing the cats, the O2 sensors provide critical data to the ECM so that it can properly tune the engine. Also, without the cats, the exhaust will forever smell gassy.
Will An O2 Sensor Work Without A Catalytic Converter Or Just a Myth?
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$4 Catalytic Converter P0420 Fix | 02 Sensor Simulator | Pass Emissions | Oxygen sensor
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How to keep the check engine off when removing catalytic converter
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