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The P1409 OBD-II code indicates an issue with the Exhaust Gas Recirculation (EGR) system, specifically related to the EGR temperature sensor circuit. This code suggests that the engine control module (ECM) has detected an abnormal reading from the EGR temperature sensor, which can lead to increased emissions and engine performance issues. Common causes include a faulty EGR valve, a malfunctioning temperature sensor, or issues with wiring and connectors in the EGR system. It is advisable to diagnose and address the problem to maintain optimal engine performance and compliance with emissions standards.

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2w ago

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