Aftermarket headers and o2 sensor placement?? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Mike86 · 04-23-2014, 09:13 PM

I just bought a rev works header and was wondering because the first o2 sensor seems to be only on 2 the runners ( not sure if thats how you say it)
But since its only on 2 cylinders wouldnt my first o2 sensor read only the afr of 2 cylinders? So lets say theres a problem in the other 2 cylinders the o2 sensor would never see it?

Might be a dumb question but it caught my attention!!

Thanks mike!

NickFRS · 04-23-2014, 09:15 PM

The 02 sensor bung should be after the collector. Unless they changed the design. Call and ask.

Mike86 · 04-23-2014, 09:18 PM

The second one is but the first is not unless im mistaking

Mike86 · 04-24-2014, 01:41 PM

No one can chime in on this?

04-23-2014, 09:13 PM	#1
Mike86 Senior Member Join Date: Nov 2012 Drives: Scion frs Location: Montreal Posts: 105 Thanks: 253 Thanked 13 Times in 13 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Aftermarket headers and o2 sensor placement?? I just bought a rev works header and was wondering because the first o2 sensor seems to be only on 2 the runners ( not sure if thats how you say it) But since its only on 2 cylinders wouldnt my first o2 sensor read only the afr of 2 cylinders? So lets say theres a problem in the other 2 cylinders the o2 sensor would never see it? Might be a dumb question but it caught my attention!! Thanks mike!

04-23-2014, 09:15 PM	#2
NickFRS Senior Member Join Date: Jun 2012 Drives: 2013 Asphalt FRS Location: Gladstone Posts: 1,450 Thanks: 899 Thanked 440 Times in 286 Posts Mentioned: 75 Post(s) Tagged: 0 Thread(s)	The 02 sensor bung should be after the collector. Unless they changed the design. Call and ask. __________________ 2013 Sion FRS 2014 Subaru WRX 2014 Subaru XV

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04-23-2014, 09:18 PM	#3
Mike86 Senior Member Join Date: Nov 2012 Drives: Scion frs Location: Montreal Posts: 105 Thanks: 253 Thanked 13 Times in 13 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	The second one is but the first is not unless im mistaking

04-24-2014, 01:41 PM	#4
Mike86 Senior Member Join Date: Nov 2012 Drives: Scion frs Location: Montreal Posts: 105 Thanks: 253 Thanked 13 Times in 13 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	No one can chime in on this?

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