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Bank 2 running rich typically indicates that the air-fuel mixture in that bank of the engine is too rich, meaning there is too much fuel relative to the amount of air. This can be caused by issues such as a faulty oxygen sensor, a malfunctioning fuel injector, or a vacuum leak that affects the air intake. Additionally, problems with the engine control unit (ECU) or a clogged air filter can also contribute to this condition. If not addressed, running rich can lead to poor fuel economy, increased emissions, and potential engine damage.

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3mo ago

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