Thread: Second O2 Sensor
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Old 04-11-2016, 05:46 AM
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Default Second O2 Sensor
I see some exhaust systems use a second O2 sensor after the cat. I am using a VF Commodore Ls3 engine and wonder if it is needed for IM240 emissions testing. The Vf does run a second one so do I leave it as per factory setup?
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