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-   -   Second O2 Sensor (http://www.clubcobra.com/forums/australian-cobra-club/136254-second-o2-sensor.html)

Cobrakiller 04-11-2016 05:46 AM
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?

Tenrocca 04-11-2016 06:16 AM
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

SydneyChris 04-12-2016 02:46 AM
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.

Chris

Cobrakiller 04-12-2016 04:47 AM
Thanks for the reply's guys.


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