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DTC codes / P24xx · Auxiliary emission controls / P24F9
P24F9 indicates that the powertrain control module (PCM) has detected an out-of-range or performance fault in the control circuit for the exhaust aftertreatment fuel air purge valve. This valve manages the flow of fuel and air into the exhaust aftertreatment system to support regeneration or temperature management, and the circuit's electrical behavior does not match the expected profile.
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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