What is the sensor visible when I open my hood that comes out of what I think is called the header or exhaust manifold (otherwise I don't have to lie I the ground to see it)? Is this the O2 sensor or A/F sensor?

 

bump.

 

Primary 02

 

Hmmm, so if my CEL refers to "Bank 1 Sensor 2", which is this? Is the the Primary O2 sensors or a secondary one? If secondary, where is that located, further down the pipe (s-pipe)?

 

actually the dealer called it a A/F sensor... even though it is bank 1 and the second is bank 2 on the S pipe.... Not sue why that is it even if you look in a scion manual it clearly states that is an A/F sensor... BTW that third cat does no good for anyone but those people who are worried about a "Greener Lifestyle" boo hoo cry me a river Al Gore because you drive a hummer... but if thats the one your talking about then It is Bank 1 and its an O2 sensor

 

1st sensor before cat built into header is an A/F sensor.

2nd sensor in the S-pipe is an O2.


And the new tC's have a 3rd cat? All I know of is 2... one under the hood, and one just at the entrance of the midpipe.

 

well mines an 06 and it does ... i donno about 08's

 

I'm fairly sure that last little bit before the axleback section is a resonator.

 

ah true... either way its restrictive.... gotta get rid of it