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What is bank one, bank two, system to lean on a 2001 ford taurus?

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I think bank 1 refers to the head with the spark plug number one and bank 2 the head with the spark plug number two. Bank 2 is located on the driver's side of the engine. System too lean means that a particular bank's oxygen sensor experienced a lean condition (too much oxygen.)

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Bank one is the left side of the engine and bank two is the right a lean condition can be caused by a vacuum leak around the intake and if it's plastic the intake it's self could be cracked

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