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Originally Posted by glenncof
Code will tell you before and after cat and bank 1 vs 2.
I think driver side is bank 1 but you should verify.
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Bank 1 is the side where cylinder 1 is (drivers side).
Bank 2 is the side where cylinder 2 is (passenger side).
Sensor 1 is 1st sensor on a side. Sensor 2 is 2nd sensor on a side. Sensor 3 is the 3rd on a side, etc.
Therefore, if there are 2 cats each with a pre and post 02 sensor, Bank 2 Sensor 1 would be the pre cat 02 sensor on the passenger side.
//2000CAYukon