i think people are starting to get mixed up with which banks are certain sensors.
B1S1, B1S2 are on the same runner. B2S1 is on the header which is supposed to monitor the rear 3 cylinders (#4,5,6) and B2S2 on the ypipe. B2S2 is BEFORE the Ypipe cat. So its reading the air after Bank 1 and Bank 2 Cats.
Though this is true, i get a Bank 2 sensor 1 code. wierd. i dont get a "inefficiency catalytic converter below threshold P0420" code. I get P1055 on Bank 2 sensor 1.
for me Bank 1 sensor 2 has been fixed with another type of NON-permanent cel fix. i'll update you guys when i figure out my issue.
06 ZCP JB M3 Active Autowerke Stage 3
sold 04 TCM sold 03 AR A650E sold 02 GGP 5SPD R.I.P. 10/31/04 01 MSM