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DTC codes / Ford codes / P1455
P1455 on Ford vehicles indicates that the evaporative emission control system has detected a substantial leak or blockage, meaning fuel vapor is escaping to the atmosphere or the system cannot purge properly. The powertrain control module runs a self-test that pressurizes or evacuates the fuel tank and vapor lines, then measures how quickly pressure changes; this code sets when the change exceeds a calibrated threshold for a large leak or restriction.
Guidance is general and written for Ford vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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