1998 Chevy Van O2 Sensor CKT No Activity (Bank 1 Sensor 2)

1998 CHEVROLET VAN
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GRAMMJR
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Engine Mechanical problem
1998 Chevy Van V8 Two Wheel Drive Automatic

Which side is bank 1 and bank 2. I have 4 02 sensors and my DTC tells me sensor on bank 1 sensor 2 is bad. I can read Sensor 11, 12, 21 and 22. I assume 11 is bank 1 before the converter, 12 is bank 1 after the converter. But do not know which side is 1 and 2. Let me know if my assumption is correct on before and after converter.
Thanks
Jim
Nov 30, 2009 at 4:40 PM
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RASMATAZ
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B1S2 -see below item location no. 4


https://www.2carpros.com/forum/automotive_pictures/12900_b1s2_1.jpg

Nov 30, 2009 at 4:57 PM