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Bank 1 is the engine bank that holds the spark plugs for cylinders 1, 2, 3, and 4. This bank is the one on the passenger side of the engine (see the illustration in the image viewer).
Bank 2 is the engine bank that holds the spark plugs for cylinders 5, 6, 7, and 8. This bank is the one on the driver side of the engine (see the illustration in the image viewer).