Lets clear up the Bank/Sensor O2 positions for good...

[AZ3.8Camaro]

So...
97 Earlier..
Bank 1 / Sensor 1 - Driver
Bank 2 / Sensor 1 - Passenger
Bank 1 / Sensor 2 - After the cat????
Bank 1 / Sensor 3 - Before the cat????

[ November 18, 2003: Message edited by: AZ3.8Camaro ]</p>

[hockeyman]

My book shows 95-97 3800 engine as follows:

Bank 1 HO2S 1 - Ex. Manifold Driver's side
Bank 2 HO2S 1 - Ex. Manifold Passenger side

Bank 1 HO2S 2 - Pre-Conveter
Bank 1 HO2S 3 - Post-Converter

-Marc

[PewterBird]

98+?

[98Camaro3.8]

98+ is the same as 95-97, only without B1S2.

[Jason McCallister]

<blockquote>quote:</font><hr>Originally posted by 98Camaro3.8:
98+ is the same as 95-97, only without B1S2.<hr></blockquote>

B1S2 on the 98+ becomes the post-cat sensor. B1S3 is non-existant.

[Magnus]

my stuff shows b1s2 being POST cat and b1s3 being precat.

[98Camaro3.8]

<blockquote>quote:</font><hr>Originally posted by Jason McCallister:


B1S2 on the 98+ becomes the post-cat sensor. B1S3 is non-existant.<hr></blockquote>

GM Service Manual calls it Sensor 3. 2 is non-existant in there.

Also from the Service Manual:
"The Bank 1 HO2S 2 sensor produces an output signal which indicates the amount of oxygen present in the exhaust gas entering the three-way catalytic converter. The Bank 1 HO2S 2 sensor produces an output signal which indicates the amount of oxygen present in the exhaust gas entering the three-way catalytic converter."

[Jason McCallister]

Pardon me.... for "Autotap" purposes, B1S3 does not exist on V6 F-Bodies with only three O2 sensors. ;)