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If the air injection blower on your 2002 Mercedes S500 won't stop running, it could be due to a faulty relay, a malfunctioning air injection pump, or a vacuum leak. Check the relay and associated wiring for any signs of damage or corrosion. Additionally, a stuck position in the control module may also cause the blower to remain active. If these checks don't resolve the issue, it's advisable to consult a professional mechanic for further diagnostics.

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