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  • less WHY; more WOT
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  • Member For: 17y 2d
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  • Location: Melbourne

there's one in the dump pipe from the turbo and there's another one after the catalytic converter. The one that matters is the one that's in the dump pipe.

 

:Welcome2FordXR6t:

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  • Member For: 9y 11m 2d

that's correct as keith said. although I would suggest if you decide to replace one, you should replace other as well. reason being is whatever caused first o2 sensor to deteriorate is probably causing second one to deteriorate as well

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  • Member For: 9y 11m 20d
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  • Location: Canberra ACT

I agree. Upstream sensor is the one helping adjust fuel trims etc and is most important to be functioning at full capacity. Downstream is basically to make sure the cat is working, so leave it till it chucks a check engine light. Upstream one would be subject to to ton of extra heat so would have thought downstream will last longer too.

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  • Member For: 17y 4m 18d
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  • Location: Probably above atmospheric pressure

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