DTC codes / P23xx · Ignition system and misfire / P2397
P2397 indicates that the engine control module has detected an out-of-range or performance fault in the intake air flow position sensor for the second intake air path, often called bank B or position B. The computer compares the sensor signal against expected values during key-on and running conditions and sets the code when the voltage or rationality check fails.
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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