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DTC codes / P23xx · Ignition system and misfire / P23BF
P23BF means the powertrain control module (PCM) has detected that the nitrogen oxide (NOx) sensor on bank 1, sensor 3 is responding too slowly when the exhaust NOx concentration rises from a low level to a high level. The PCM monitors the sensor's signal during specific driving conditions and flags the code when the sensor's output lags beyond a calibrated time 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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