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DTC codes / P23xx · Ignition system and misfire / P239D
P239D indicates that the engine control module has detected insufficient air flow through the diesel intake air flow B control system, which typically controls a swirl flap or intake runner valve. The computer commands the actuator to a position and then checks the resulting air flow via the mass air flow sensor, and when the expected change does not occur, it sets this code.
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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