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DTC codes / P24xx · Auxiliary emission controls / P2437
P2437 means the powertrain control module (PCM) has detected a low signal from the secondary air injection (SAI) system's air flow or pressure sensor on bank 2. The sensor circuit is reporting a voltage or pressure reading below the expected range, so the PCM cannot verify that the SAI system is delivering the correct air flow during cold starts.
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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