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Second O2 Sensor

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4 Post By Tenrocca

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#1 (permalink)

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04-11-2016, 05:46 AM

Cobrakiller Cobrakiller is offline

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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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04-11-2016, 06:16 AM

Tenrocca

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Not necessary. Only there to check your cats are OK. Doesn't affect emissions as such. Don't install and turn off in tune. Cheers

Gav, gjkrv8, Modena and 1 others like this.

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04-12-2016, 02:46 AM

SydneyChris SydneyChris is offline

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Am running the same configuration.. you only need the pre cat pair. Get your ECU tuner to delete the second set of sensors from the scan so you dont get MIL codes / light popping up every time you start up.

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04-12-2016, 04:47 AM

Cobrakiller Cobrakiller is offline

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Thanks for the reply's guys.

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