DTC codes / P01xx · Fuel and air metering / P014C
P014C indicates that the upstream oxygen sensor on bank 1 is responding too slowly when the engine transitions from a rich to a lean condition. The powertrain control module monitors the sensor's voltage switching time and sets this code when the response exceeds the calibrated threshold.
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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