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DTC codes / P23xx · Ignition system and misfire / P23BD
P23BD means the powertrain control module has detected that the nitrogen oxide (NOx) sensor signal from bank 1 sensor 3 is biased high or stuck at a high value. The sensor is reporting a continuously elevated NOx reading that does not respond normally to changes in engine operation, so the computer cannot trust the exhaust aftertreatment feedback.
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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