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DTC codes / P24xx · Auxiliary emission controls / P2407
P2407 means the engine computer has detected an intermittent or erratic signal from the leak detection pump sense circuit, which monitors the evaporative emission system's ability to detect leaks. The computer expects a steady voltage or resistance from the sensor, but the signal is dropping out or jumping around, so it cannot trust the leak detection pump's feedback.
Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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