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The Benz engine fault code P2004 typically indicates an issue with the intake manifold runner control (IMRC) system. This code often signifies that the intake manifold runner is stuck in the open position, which can affect engine performance, fuel efficiency, and emissions. Common causes include a malfunctioning IMRC actuator, a faulty sensor, or issues with the intake manifold itself. Addressing this code usually involves inspecting these components and performing necessary repairs or replacements.

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