Bank 1 and Bank 2

What is Bank 1 and Bank 2?

Bank 1 and Bank 2 simply refer to either side of the engine. Check your owner’s manual for definite clarification of upstream (Bank 1) and downstream (Bank 2) banks. Bank 1 is most commonly found by the front most cylinder on the engine (Cylinder 1), and Bank 2 is the opposite side of the engine. In each of these banks you can usually find respective O2 sensors 

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Comments 1


August 15, 2018

This helps to clarify the meaning of bank one and bank two