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DTC codes / P23xx · Ignition system and misfire / P239A
P239A indicates that the engine control module has detected an intermittent or erratic signal from the intake air flow position sensor for bank B in a diesel engine. The sensor's feedback voltage or position reading jumps or drops out rather than changing smoothly, so the computer cannot trust the airflow measurement.
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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