Upstream or Downstream O2 Sensors

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07-07-2011, 12:54 PM

bmartin8

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Upstream or Downstream O2 Sensors

Which ones are removed when headers are installed? Downstream/Rear correct? I need to replace the two I have now, but I can never remember if they are the upstream/fronts or the downstream/rears.

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07-07-2011, 01:04 PM

senicalj4579

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The ones closer the the engine are upstream

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07-07-2011, 01:43 PM

Floorman279

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Quote:

Originally Posted by bmartin8

Which ones are removed when headers are installed? Downstream/Rear correct? I need to replace the two I have now, but I can never remember if they are the upstream/fronts or the downstream/rears.

all 4 o2s are the same btw