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O 2 sensor bank 1 sensor 1 location on 2003 sierra


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Bank one is driver's side of engine. The "1" is for the #1 cylinder side. Bank "2" is passenger side for #2 cylinder location. You have 4 sensors 2 each side. 1 before the cats. 1 after the cats.

 

Bank 1, sensor 1 is Driver's side, before the cat. Bank 1, sensor 2 is driver's side, after cat. Got it?

Edited by txab
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