catalytic converter/ o2 sensor

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05-04-2009, 05:37 PM

N1a6Germ

1st Gear

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Join Date: Mar 2009

Posts: 30

catalytic converter/ o2 sensor

o2 sensors located directly on the catalytic converters, are those o2 sensors considered Pre or Post sensors?

05-04-2009, 11:27 PM

chefro

3rd Gear

Join Date: Dec 2008

Location: IL

Posts: 1,941

Those are the "post" or "downstream" ones.
The "pre" or "upstream" ones are located on the exhaust heads, right before the connection flange with the downpipes.

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