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DTC P1455: Fuel Tank Leak Detected: Notes

WARNING: This page is about a different car, the 2003 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.
WARNING: Read service precautions before proceeding with service procedure. See SERVICE PRECAUTIONS .
CAUTION: If Engine Control Module (ECM) replacement is instructed in following test, always ensure ECM connectors and ground circuits are okay. If either are defective, repair and repeat testing to confirm ECM malfunction.