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fleshthorn
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| Posted: May 04 2010 at 9:24am | IP Logged
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I recently replaced the upstream ( manifold) O2 sensor on my 2001 Nissan Frontier 2WD with 4 banger engine. I was eye balling the down stream O2 sensor, thinking about replacing it when I noticed that it is located IN FRONT of the converter not after it. How is this arrangement supposed to work ? How can the computer dtermine anything about the efficiency of the converter with BOTH O2 sensor mounted upstream ? I am the original owner and the exhaust system is 100 % factory original.
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frontierguy
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| Posted: May 04 2010 at 8:18pm | IP Logged
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The 3 way cat is attached to the manifold. That is why there is an O2 sensor before and after it.
__________________
'10 Altima SL
Traded 08 Frontier for 16 Frontier SV CC Long box, quite an upgrade. I do miss the 6 speed and Dynomax ex.
Nissan Technician 25 + years
2011 John Deere X720SE
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fleshthorn
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| Posted: May 05 2010 at 9:07am | IP Logged
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I understand now. There is a front cat underneath the heat shroud right beneath the upstream O2 sensor. I never realized there were two of them. Amazing!
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Nissan Frontier Forums : Problems / Technical
Topic: Odd O2 arrangement
