Question about 2002 Toyota Camry

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3l, 6 cyl (California emissions). Where is the 4th O2 or (A/F) sensor?

I can find 3 of the 4 O2 or (A/F)(O2)sensors. Standing in front of car, I see the 1st one coming out of manifold in the 1st cat.on the right side of engine. Under the car > still towards the front of the engine I see 2 more O2 sensors. Where is The 4th one?

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HO2S( heated sensor) are before the cat convertor either in the manifold or exhaust pipe to the cat converter
O2 sensors are in the exhaust after the cat converter/s
I am drawing the difference because they are not all O2 sensors as each has a different operation for the position in the exhaust
the missing one will be in the exhaust manifold or pipe at a convenient position for servicing before the cat converter

Posted on Jan 09, 2016

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Posted on Jan 02, 2017

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1kbron_121.gif


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