OBD PO134 BANK1 OR BANK2 Q&A

What is Bank 1 and Bank 2?

There are a number of OBD-II trouble codes that refer to either Bank 1 or Bank 2. There are conflicting messages on Bank 1 versus Bank 2, so we're trying to set the record straight.

Quite simply, Bank 1 refers to the side of the engine that has the #1 cylinder. Bank 2 is the opposite side of the engine.

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