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DTC codes / P23xx · Ignition system and misfire / P23BE
P23BE means the powertrain control module has detected that the nitrogen oxide (NOx) sensor on bank 1, sensor 3 is reporting a signal that is biased low or stuck low compared to what the module expects from the exhaust conditions. The sensor is part of the selective catalytic reduction system, and the module uses its output to verify that oxides of nitrogen are being reduced properly.
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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