DTC codes / Mazda codes / P1683
P1683 on Mazda vehicles indicates that the powertrain control module (PCM) has detected an abnormal signal from the metering oil pump temperature sensor circuit. This sensor monitors the temperature of the metering oil pump, which is critical for proper lubrication in certain Mazda engines, and the PCM sets the code when the sensor voltage falls outside the expected range.
Guidance is general and written for Mazda vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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