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If your Lexus IS300 engine won't turn off, it could be due to a faulty ignition switch, a malfunctioning relay, or a stuck key in the ignition. Additionally, issues with the vehicle's electrical system, such as a short circuit, could prevent the engine from shutting down. In some cases, problems with the engine control unit (ECU) may also cause this issue. It's best to consult a professional mechanic to diagnose and resolve the problem.

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5mo ago

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