DTC codes / P23xx · Ignition system and misfire / P23BA
P23BA means the engine computer has detected an intermittent fault in the heater sense circuit for the third nitrogen oxide (NOx) sensor on bank 1, which is the side of the engine containing cylinder one. The computer monitors the heater element's electrical feedback to confirm the sensor reaches operating temperature, and an intermittent signal means the circuit is making and breaking contact rather than failing completely.
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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